I’ve found my crush strength is best When I neglect all training except grippers. I’m not at all recommending you do this, I just threw it out there because gripper strength was one of your goals. I actually go crazy when I’m training for a gripper cert or competition that has grippers in it because I have to take off at least 3 days before a gripper session and I can’t do all the things I want to.
in the beginning you can probably throw grippers in the mix without much complication, but as you get stronger you will plateau hard with grippers. I think this is because grippers are one of the more CNS dependent things we do in grip. If you aren’t well rested you will fail grippers that have been easier for you in the past.