My grip is beginning to fail me on the deadlift (sumo). I'm doing Madcow 5x5 and I'm up to 130kg on my max set and on the last 2 repetitions, the double overhand grip doesn't feel very secure and it's a real battle to hold on to the bar. But the lift is actually quite smooth and fluid; it's just that my grip is weak. Is there an easy way to strengthen the double overhand grip or should I just switch to the hook grip now? I don't like the mixed grip.
How do I figure out the optimal stance for the sumo deadlift? I feel like my stance is optimal but, on the other hand, it looks fairly narrow compared to what I have seen online.
I also want to learn the snatch. Firstly, I need to build up shoulder mobility by shoulder dislocates; is this the best way? Secondly, how do I figure out the optimal grip width for the snatch? I'm pretty sure that you have to figure it out by setting your grip such that the bar hangs at a certain position relative to your body.
Thanks for any help.