You don't really need to worry about the cool down penalty unless your character is seriously over weighed ie javelin and spitfire which could add a few seconds extra cool down to tech armour, but then I guess your build would be far less focused on powers.
I think the rule of thumb is that if your weight is +140 or better then your power's cool downs are not affected that much anyway.
But for tech armour detonations, try this build
http://kalence.drupa...34652384!6FEB5S
Turn on annihilation field and tech armour, run in, detonate tech armour! And once the easy waves have passed, you can then play the classic build of using annihilation field followed by warp for BEs and talon shots to cause serious damage.