I've tried lower vsel settings but they all rebooted my phone :-/
Why would lower help? One or more of your vsel settngs are too low as it is. Finding out which one(s) is unique to every phone. I suggest cranking them all up, then lowering each individually until your phone crashes during intense testing. Then you'll know where each lower limit is.
Edit: actually, all of your settings already look pretty high, perhaps too high. OCing is definitely more of an art with no hard and fast rules.