WTF? You say your motor will never see a mechanics shop? Yet you plan to make 6:1CR work? Why would ANYONE ever want a CR that low?

Mine is nothing like that low, it is low 7's and I run 30psi and around 320bhp (290bhp atw). Some would say my CR is too low.

Sorry to be negative, but I think you may have some expensive learning ahead of you.....

Some of which has already happened with your broken rings/ring-lands.