Uncut said it perfectly!
Every penis is uniquely shaped and as I've long since learned, 2 numeric measurements isn't enough info to judge. A box of magnums is 10 bucks, it's not breaking the bank

. If regs are fitting good, I'd say stick with em, unless you're afraid their short length will cause your partner's 'grip' to pull em off, which would of course be really bad. An 8 inch dick seems like a larger size would be in order though.