Hmmm never had KB and TK on same hero. I don't use TK too much on my mind trollers. If I recall correctly Levitate makes mob flip while repelling.
In theory, KB will probably push mob further than Repel's effect but when TK caught him again he will continue being repeled. For Tornado it can be tricky as it doesn't hit from a certain direction and can push your target out of repel aura. Corners a bit better but a single wall is like a gamble with Tornado.
Also don't forget about "Mob in the wall" side effect of game engine so you can end up cursing yourself for not being able to complete a defeat all mission. 
Thanks for the info.
I guess the question is - which has the higher mag, repel of TK or the KB in Tornado?
I'm basically looking to make a high damage Storm troller that can make use of Tornado - I've got at least one of each of the other Primaries on the go so Mind is the obvious choice dependent on the answer to this query.
On a side note, have you tried farming with your Mind/Kin?
I was wondering how much damage an FS'd Terrify does in a padded map?
If your able to wipe out each spawn with one application of Terrify it could be very effective; not that I farm at all, just out of interest.
L50s: Tanks: Cryofission - Ice/EM - Dr Celsius - Fire/Ice - Saint George - SD/SS | Controllers: Psichosis - Ill/Kin - Major Chaos - Ill/Stm | Scrappers - Neutron Crusader - DM/SR
Currently Levelling: Angelic Blade - BS/WP Scrapper | Seeds of Destruction - Plant/Kin Controller
Hmm yeah that is a good question. I had one mind/storm but deleted him. If you looking for a high damage strom troller I guess fire/storm is way much better than fire/rad from what I heard.
Mind has good damage output. After Fire and Plant has highest damage possibly but after level 40 your psychic damage mostly resisted.
I never farm, finding it too boring (hate defeat all missions and while soloing I ghost whenever it is possible to shorten missions). Terrify's damage out put ain't that high (but I am always slotting mine with Glimpse of Abyss for bonuses). Only spawns I can wipe out with single apllication of Terrify + FS was Croatoa Ghost when Araf was level 45+. 
You can reach higher damage numbers with damage sets + assault + global damage bonuses etc.
If you ask my personal opinion Mind is a better single target damage set and it depends only one power: Levitate. I've been in teams with some Mind/Storm trollers in the past while leveling up Psy-knight (my first 50 Mind/Rad). They were usually dead while I was okay and carry on fighting. Mind is too delicate (no real fast AoE immob) versus the very chaotic nature of Storm. For soloing it's awesome combo but for teams I guess you will be a hate-magnet in teams. Some people hate Confuse and TK, most people hate KBs. I once in a team whose leader said he won't accpets Stormers in his team. This was why I rolled a Mind/Storm as I've already have 2 high level mind trollers and leveled a Storm defender to see what set looks like. It was a challange for me which I am delaying for now. I am sure my next level 50 Mind troller will be a Mind/Storm (other than regular team Mind/FF).
I hope this helps you a bit.
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Mind is too delicate (no real fast AoE immob) versus the very chaotic nature of Storm. For soloing it's awesome combo but for teams I guess you will be a hate-magnet in teams. Some people hate Confuse and TK, most people hate KBs. I once in a team whose leader said he won't accpets Stormers in his team.
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I've got an Illusion/Storm in the 40's and I've never experienced any hate at all although I have read about it in the forums.
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I've been in teams with some Mind/Storm trollers in the past while leveling up Psy-knight (my first 50 Mind/Rad). They were usually dead while I was okay and carry on fighting.
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I'd put this more down to you being a better player - I've found Storm to be every bit as survivable as Rad - at least post L16 (Freezing Rain).
L50s: Tanks: Cryofission - Ice/EM - Dr Celsius - Fire/Ice - Saint George - SD/SS | Controllers: Psichosis - Ill/Kin - Major Chaos - Ill/Stm | Scrappers - Neutron Crusader - DM/SR
Currently Levelling: Angelic Blade - BS/WP Scrapper | Seeds of Destruction - Plant/Kin Controller
KB works as advertised on Telekinetically held mobs from my experience. I use Levitate on my Mind/Rad and it will knockup mobs that are being held with Telekinesis. Its quite useful if they get stuck on a small protrusion before you can get them into a corner.
Actually I have a question about Telekinesis too: (Well a few anyway...)
How does the Hold component work?
Does it stack with normal holds?
Does it only stack with other Telekinesis applications (eg from another character)?
What magnitude is the hold?
Reason I ask is I run a mind/rad duo, both have telekinesis, but when both have it active on the same mob the results are not always as I'd expect them to be.
The hold is mag 1 iirc and yes it stacks with other holds
Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant
It stacks indeed, but I'm under the impression it holds everything but bosses, so that would make it mag 3?
It's mag 3.
If it was mag 1 it would only work on underlings!
I really should do something about this signature.
I was going by what I had heard a year or so ago hence the qualification. I have it on my mind dom but not my mind 'troller but rarely play either these days.
Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant
Has Telekinesis got any KB in it?
I'm currently considering making a Mind/Storm and wondered if a mob held against a wall with TK would be thrown about if Nado was thrown at him?
I'm assuming yes from what I've read but thought I'd ask.
L50s: Tanks: Cryofission - Ice/EM - Dr Celsius - Fire/Ice - Saint George - SD/SS | Controllers: Psichosis - Ill/Kin - Major Chaos - Ill/Stm | Scrappers - Neutron Crusader - DM/SR
Currently Levelling: Angelic Blade - BS/WP Scrapper | Seeds of Destruction - Plant/Kin Controller