I like your guide, and given how you want to play, I think it's a pretty good build, but I'll offer up an alternative for the solo player who only teams infrequently at best:
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Exported from Ver: 1.7.5.0 of the CoH_CoV Character Builder
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Name:
Level: 50
Archetype: Corruptor
Primary: Sonic Blast
Secondary: Kinetics
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01) --> Shriek==> Acc(1)Dmg(3)Dmg(5)Dmg(13)
01) --> Transfusion==> Acc(1)Heal(7)Heal(15)Heal(15)EndRdx(17)
02) --> Scream==> Acc(2)Dmg(3)Dmg(5)Dmg(13)
04) --> Siphon Power==> Acc(4)Rechg(7)EndRdx(19)
06) --> Combat Jumping==> Jump(6)
08) --> Shout==> Acc(8)Dmg(9)Dmg(9)Dmg(11)EndRdx(19)
10) --> Siphon Speed==> Acc(10)Rechg(11)Rechg(17)
12) --> Amplify==> Rechg(12)
14) --> Super Jump==> Jump(14)
16) --> Swift==> Run(16)
18) --> Health==> Heal(18)Heal(34)Heal(34)
20) --> Stamina==> EndMod(20)EndMod(21)EndMod(21)
22) --> Siren's Song==> Acc(22)Acc(23)Sleep(23)EndRdx(25)Rechg(25)Sleep(34)
24) --> Acrobatics==> EndRdx(24)
26) --> Hasten==> Rechg(26)Rechg(27)Rechg(27)
28) --> Repel==> EndRdx(28)EndRdx(29)EndRdx(29)
30) --> Screech==> Acc(30)DisDur(31)Rechg(31)EndRdx(31)DisDur(37)DisDur(40)
32) --> Dreadful Wail==> Acc(32)Dmg(33)Dmg(33)Dmg(33)
35) --> Transference==> Acc(35)EndMod(36)EndMod(36)EndMod(36)Rechg(37)Rechg(37)
38) --> Fulcrum Shift==> Acc(38)Acc(39)Rechg(39)Rechg(39)EndRdx(40)EndRdx(40)
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01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
02) --> Rest==> Empty(2)
01) --> Scourge==> Empty(1)
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Most of this build is self explanatory, but I'll include a few explanations:
Q: What? Only one accuracy in most of your attacks?
A: Yep, Amplify at 12 will give you that extra accuracy when you need it, and with Siphon Speed being used as a major debuffing tool throughout your career post 10, you'll be seeing it come back up quite fast, even unslotted.
Q: Why did you only take the sleep cone?
A: I prefer single target attacks. They're easier to manage, they have reliable dmg/end, and they allow you to single out the one you want to drop. So, you sleep a group of mobs, and in there is a lieutenant and a bunch of minions, or a boss a lt and some minions. Sleep should hit most if not all mobs (2 acc), putting everything but the boss to sleep. The boss is then tackled while his support provides a nice, easy to hit mob that can be used to heal off of, without breaking the sleep. Meanwhile, you keep stacking Siphons on him and blasting him to dust. Fully slotted, your sleep cone is going to last around 50 seconds, which is probably enough time to take out just about every mob before even one of them wakes up. Also, unless the mob has special stun resistance, a stacked disorient should put any mob short of an AV out of action, and with the slotting I've recommended, you can keep disorent stacked continuously, or you can chain repel him into a corner. Note, you can certainly take the damaging cone if you like, and in my build, that would mean giving up the short range, high damage attack. Personally, I find I can defeat most mobs with just the first two attacks, and only use the close range one if I need to heal or if a mob runs up to me to melee.
Q: You didn't take ANY team buffs! Why not?
A: This is a soloing build. As such, there is no team that can't benefit from this build, because any build that solos well, also tends to team well. Yes, Speed Boost and Intertial Reduction are good, but so is everything else I've taken, in a team setting. Acrobatics is huge, as you can't do anything if you're on your back. Your powers are all click type, so unless you want to be stocking a tray full of break frees all the time, it is to your benefit to have acrobatics, which gives you super jump, which is of course great. You get Stamina at 20, and believe me, you'll want that.
Q: Why did you choose X power before Y power?
A: No particular reason, actually. I'm only level 13 currently, and after 20, there are a lot of things I could see swapping around. I think that given how the slots fall out, though, this is going to work out the best for me.
So there you go, my idea of what a pure solo sonic/kinetic looks like. So far, so good. I'm playing on the lowest difficulty setting and so far it's working out fine.
Edit: After careful consideration, I'm of the OP's opinion that Repel is fairly unnecessary. By leaving it out, you could get one of the team buffs (I'd probably choose speed boost over increase density, but not by much of a margin, they are both good) and three slot it. Repel is highly situational at best, as many of your powers depend on NOT throwing mobs all over the place, but keeping them close by. As a soloer, I might consider the damaging cone. I could probably find a slot somewhere (like from Health) to make it 1acc/3dmg. Another good option is Stealth. It's always nice to be able to travel in relative safety. Any of these would probably be more useful than Repel.
