Hi Trooper,
just two things about the bite.
The unmodified
"poison bite" racial power is underpowered. Imho you should compensate for the missing prof. and magic weapon bonus somehow.
+2,+4,+6 to the attack should do it. I also think that
slowed (save ends) should be a standard feature of the racial attack, cause the damage of the bite isn't great and targets only one creature.
I would also change the feat "paralyzing bite" so that the enemy gets
dazed (save ends) or
stunned until the end of your next turn. Dazed is more in line but thinking of a thri-kreen biting you and your muscles just go on fire, stunning you in pain, is just cool. Just remember, if you go stunned, dont forget the normal effect of your bite and make it also
aftereffect: slowed(save ends).