6.0 is great for boost, pistons are the weak link IMO. sounds like you have a great combo going. I dont use the 1:1 rise on the reg, it just complicates tuning, better to have a solid stable pressure. 13-15 psi is too high for stock pistons to live long in my exp... The 317 heads are better for boost b/c they have a thicker deck, L92 heads have a thin deck that is said to not take as much boost and cause head gasket failure. Good luck with the build