Teach me how to gunstock - Index Controllers + OneStock

I got the WieldVR Gunstock - OneStock.

It's cool cause there's no magnets, so you just kinda slap your hands into place. The problem is the index controller grip function. I tried setting it to toggle, which does help a bit, but I'm still dropping my guns in the middle of firefights sometimes.

Specifically looking for info from players who use a gunstock with index controllers. What is your best setup? Separate the drop button? Learn to play? What works for you? What can I try?