I'll throw in my 2 cents on the subject...
Forget about reps on the grippers, you want grip strength, go for negatives and timed holds. Reps are for show IMO.
I'm glad that you've had the mindset not to neglect training your grip. A lot of lifters don't.
This usually tells me nothing. Do you use straps on any of your lifts? If so, don't. That would be a start.
The #1 and the #2.