You can get a set of pistons made for around $600.
I am running SRP 10.4:1 pistons that have been radiused, and a little clean up on the heads. Did it get it below 10:1? I do not know but it should be close.
I have been running 93 with no problems, never tried anything lower. Aluminum heads help too.
Since you have dished pistons, you might be OK. Do the math to find the real CR.
The 302s are really fun! I am running a large journal DZ in my 914! Spins up like a Porsche.