1) For club racing I run a Larger tire for longer use of each tire. Usually start 44mm and run them down to the wheel.
Fronts I start at 43 and run them till they are no longer useful usually about 40mm
For big races Rear 42 fronts 41
2) Making them smaller is the best way to limit "Chunking" Also you can runa bead of CA on the edge but as the tire flexes it will break off and you will have to keep on applying it .
3) min is 3mm F/R All depends on the track I run for our club racing 4mm (it's bumpy)
4)That all depends on where you run but kepp a set to test with from yellow right to Magenta Rears and pink to Black fronts once you find the right tires for that track you will not change much
5) Any of the Protoform Thick (.030") bodies will hold up. but are heavier and again it depends on the class you are running (Stock or Mod)