I've been practicing alot between my own mat setup at home and x golf, and I just can't anymore cause I have such severe hand pain. I'm sure some of this has to do with i just need to relax, but I find that both the overlapping grip and interlocking just put a ton of pressure on my pinging and the outside of my hand on my trial hand (right hand). And I think I 10 finger grip could really help this, but I don't know anyone that plays this grip?