Snail cams are great - but - the hole on the T-Pro is too far forward to use them.
With the Onza ones, try and make sure the back plate is as flat as possible. The slot in it should allow the bolt to sit in a straight line. If that fails, give some Gusset Kojak ones a try, they are all made of steel and the threaded bar is 8mm instead of 6mm, much stronger