Try not to use the straps on all your sets. Work forearms seperately 2 times per week, you can get them to catch up to be able to hold the 315 for 10 pretty easily. Though once you get up in the 500lbs range, You are going to need a lot of forearm strength to do that for reps. Sure Franco could but most of us arent him. I use one hand underhand grip and use a strap on that hand for heavy lifts and not on the overhead griping hand. I try to switch off to stay in balance. This helps me to go heavy and still be gripping the bar, at least partially.