Change the cam to something with a later intake closing point to reduce the dynamic cr.
I also like the idea of milling off a portion on the piston to create a "step head" shape.

Using the Wallace dynamic compression calculator, at 10.2:1 cr, and the cam installed at 106, your dynamic cr would be 7.78:1. That's within the pump gas compatibility range if you have decent quench.
The step head piston/get some quench idea is making good sense.