Piston Choice on 318

I know this is an old thread but to clear some stuff up hyperstedic pistons are high in silicate allowing for good heat resistance ya more brittle but actually higher heat quality idi diesel engines use factory mohlie hyperstedic pistons running 22:1 compression and I have personally put 17 psi of boost on top of that for 60 thousand miles yes when heads were removed they had hyper cracks in 6 of the 8 pistons but was still running when removed ,removed due to lifting the heads from over boosting so often but a testimony to how resilient they really are