You may want to sell the cams, springs and retainers and go with the buddy springs and retainers. BC was having a hard time shipping retainers. and if they still are out of stock the KMS titatiums are a perfect snap fit for the buddy springs. A tear down after about 5,000 miles showed they did not move or wear at all on the springs.

A little more compression would help, but if you don't want to pull the motor, you could do a thinner head gasket.