yeah thats chunking and shredding. some compounds do that, others granulate. i like nitto 555s because they granulate, i also like falken ziex and st115s. both granulate.

t1-s are awesome for drift but they chunk. they probably have to be shaved in order to perform better.

also that happening to a tire has alot to do with track compound. at DDAY the compound is awesome so expect to get lots of life out of your tires.