Stepped piston hitting head, options and advice needed.

Yeah, they are pretty big.

The one thing I will give KB credit for is that they seem to have looked at 2-3 major applications with the most common heads that folks will likely use, and then tailored their pistons to get close to a good gasoline fuel CR for those 2-3 of major application types. They seem to have covered both street cams and bigger drag strip cams pretty well for quite a number of engine sizes, both stroked and not, and with closed and open chamber heads in mind.

The only other piston mfr that I have seen do this much was TRW back in the day; they had quite an amazing variety of specialized pistons in the 70's.