Help me choose apex seals and bearings

[MacGyver]

Do you machine the pump housing or the iron? I am thinking about doing this for the RE

The examples I've seen were on the pump housing. It is a variation of the notebook paper gasket but should not change the stack-up clearance.

Pressure is insane. I constantly blow out the o-ring in the front cover and it ends up in the filter.

Was yours at this pressure level even with the stock FD regulator?