4 mallets traditional grip improvements

Hey everyone. I've been using the traditional grip ever since I started using 4 mallets. But I feel stuck. I'm playing Yellow after the rain currently, and it doesn't sound bad overall, but I'm having trouble with the lateral 4th (not sure about the name as I don't usually use English). My mallets are kind of floppy and I don't understand how I can improve it, as I feel like my hands are stuck. I still have one month and half to learn it so I'm good, but I wonder if I should start learning a new grip ? Or do you guys have any idea of exercises I could do to improve my traditional grip ? (Maybe videos/books or anything tbh).

Thanks.