Sorry to hear about the tops of your pistons coming apart. First off - I would definitely recommend forged pistons for any boosted application (turbo or supercharged). They are simply stronger than any cast piston can be, due to the grain structure imparted by the forging operation. (Hypereutectic pistons are cast from a higher silicon alloy than standard OEM type cast pistons, but they are castings, all the same). I think the Hypereutectics are OK for most naturally aspirated engines, and possibly a light load of nitrous once in a while, but stick with the forged slugs for the heavy duty work.
BUY THE BEST, AND ONLY CRY ONCE !!!!
Steve M (metallurgical engineer).