You could try the thumb below your fingers - I forget the name of this grip (old age). I use this grip and it is an improvement over the normal grip. You get used to it quite quickly. Also, you can improve you grip with these -
2 Attachments
Won't you crush your thumb on the bar?
It's not so much that I'm losing grip yet, it's just the bar tearing my callused hands up after repeated reps.
@TGR started
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You could try the thumb below your fingers - I forget the name of this grip (old age). I use this grip and it is an improvement over the normal grip. You get used to it quite quickly.
Also, you can improve you grip with these -
2 Attachments