Next you could either carry on running to see if prime remains stable for 12 hours or more. Or try multiplyer @ 44. Look for the whea-logger warnings several times throughout prime running. If it you see any or prime fails or bsod occurs you can go back to the current 4.3 oc if you save that. You could then add a touch to the bclk like you had initially which would give something just under 4.4. If that fails, just keep knocking bclk down a tiny nudge and retest each time.