Well, for a start, don't get BOTH TP and Fly.
You really need to put in slots to get some real advice tbh...
Well alright then I'll give you a hand to get started 
First up you should probably realise that the slotting might well change as you level up. Propel is invaluable until about 30 as it does really great damage with containment, especially if you solo a lot, but on higher level teams a scrapper can often take down your target before you can get the animation off so you perhaps don't need so many slots in there later. For the same reason you don't need 3 hold durations in Gravity Distortion in the later game, so you could slot for acc/dmg/rchg instead. But in general:
GDF is gonna need plenty of accuracy (2 minimum), and probably 3 hold durations (as it's hold time is less that GD)
Propel has gotta take 2 acc and 3 dmg early on at least -- i use the last slot for a range enhancer as you have to get a bit too close to aggro land for my taste on the vanilla set up.
Crush is gonna take immobs and an acc minimum, some would slot for damage, some for recharge (I dont have it personally ...)
Singy has lots of options available depending on what you want him to do for you. I have mine slotted with hold durations and damage so he can do all my donkey work but I could see a case for dmg and rchg if you want to use him as a tank all the time and beam him into mobs ahead of the team. I think Singy's acc is fine as it is really, he seems to get the job done without needing any more help there.
Wormhole as an AOE is gonna need 2 accs like GDF to be reliable, I also have 3 disorients in mine, and the last one I think is a rchg as its so damn handy to have around. Based on the power of scrappers and blasters later I'm thinking about adding more rchg in place of the disorients atm... and you seriously want to think about crushing field to go with that power as they work brilliantly together! Wormhole and CF, followed by beaming Singy into the middle of the mob is about as close as you can get as a controller to being able to put your feet up or go and get some coffee without fear of finding yourself facedown in the dirt. Ditch either TP or Fly to fit CF in would be my advice.
A lot of people say take recall for use in moving Singy about, and if that's your reason then you might not need it as I haven't found it that useful. Singy is damn good at following you about these days (although mine is always speed boosted so he gets about FAST), and you cant recall him to a point close to the action that well anyway. If you need to put him into a mob you're better off just summoning a new one I find. Still, recall's such a great team power to have that there's always room for it...
Well there ya go, there's a start for you on the grav side. You really outta try some slots on hero planner or something and post them because people will get back to you I'm sure!
Thought I would post this build on here. Its a respec for a 50 troller attended for pvp play in RV. Hopefully the pvp bit explains the judicious use of acc enhancements especially in singy. Its a very offensive build (or well thats the concept) with the potential I hope for decent damage. Perhaps the most contentious issue for me is what epic to go for-fire is nice for the largely unresisted damage and great shield (would give 40% to fire with steamy mist). I think consume for a non melee character is potentially life threatening but end recovery may be an issue with a /storm. On this note primal may be better. Well I will hopefully see what you guys think. The concept is damage dealing as well as control hence I went with fire. Although it is not acknowledged to be a good pvp epic-could ICE be useful. A strong single target attack that slows (complements set) and hibernate which in the setting of pvp could also be very useful (for 30 secs at least).
Any experience of epics in pvp welcome 
.
Well heres the build...
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Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder - (http://sherksilver.coldfront.net/index.php)
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Name:
Level: 50
Archetype: Controller
Primary: Gravity Control
Secondary: Storm Summoning
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01) --> Crush==> Acc(1) Acc(3) Dmg(9) Dmg(15) Dmg(19)
01) --> Gale==> Acc(1) Acc(3)
02) --> Gravity Distortion==> Acc(2) Acc(5) Dmg(11) Dmg(15) Dmg(31)
04) --> Lift==> Acc(4) Acc(5) Dmg(11) Dmg(13) Dmg(31)
06) --> Propel==> Acc(6) Acc(7) Dmg(7) Dmg(27) Dmg(29)
08) --> Combat Jumping==> Jump(8) Jump(9) Jump(36)
10) --> Steamy Mist==> Acc(10) DmgRes(36) DmgRes(36) DmgRes(37)
12) --> Hurdle==> Jump(12) Jump(13) Jump(43)
14) --> Super Jump==> Jump(14)
16) --> Freezing Rain==> Rechg(16) Rechg(17) Rechg(17) Slow(19) DefDeBuf(43)
18) --> Health==> Heal(18)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Hurricane==> EndRdx(22) TH_DeBuf(23) TH_DeBuf(23) TH_DeBuf(37)
24) --> Gravity Distortion Field==> Acc(24) Acc(25) Rechg(25) Slow(34)
26) --> Wormhole==> Acc(26) Acc(27) Rechg(29) Range(31) Range(40)
28) --> Acrobatics==> EndRdx(28)
30) --> Crushing Field==> Acc(30) Acc(46) Slow(46)
32) --> Singularity==> Dmg(32) Dmg(33) Dmg(33) Acc(33) Acc(34) Hold(34)
35) --> Tornado==> DefDeBuf(35) DefDeBuf(37) DefDeBuf(40)
38) --> Lightning Storm==> Empty(38) Acc(39) Dmg(39) Dmg(39) Dmg(40)
41) --> Fire Blast==> Acc(41) Acc(42) Dmg(42) Dmg(42) Dmg(43)
44) --> Fire Shield==> EndRdx(44) DmgRes(45) DmgRes(45) DmgRes(45)
47) --> Fire Ball==> Acc(47) Acc(48) Dmg(48) Dmg(48) Dmg(50)
49) --> Consume==> Acc(49) EndMod(50) EndMod(50)
---------------------------------------------
01) --> Sprint==> Run(1) Run(46)
01) --> Brawl==> Acc(1)
01) --> Containment==> Empty(1)
02) --> Rest==> Rechg(2)
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Thanks DD
Hey! I now made a Gravi/storm controller I only shown the build I just quickly made as I Dont know where to put any enhancers in this power combo as im completly new to this power combo so any/all advice is appreciated!
01) --> Crush
01) --> Gale
02) --> Gravity Distortion
04) --> Snow Storm
06) --> Propel
08) --> Swift
10) --> Steamy Mist
12) --> Air Superiority
14) --> Fly
16) --> Health
18) --> Gravity Distortion Field
20) --> Stamina
22) --> Hurricane
24) --> Freezing Rain
26) --> Wormhole
28) --> Recall Friend
30) --> Teleport
32) --> Singularity
35) --> Tornado
38) --> Lightning Storm
41) --> Hibernate
44) --> Frozen Armor
47) --> Ice Blast
49) --> Ice Storm