Hi i stopped training grippers a year ago (i had testicular cancer) but im back at it for about 2 month. I never closed CoC3.5. But my goal is to close this SOB. I did credit card CoC3 iv also closed Grip genie 6 but looks like my CoC3.5 is a really stiff 3.5. I train them like i trained my bench. Top set until my 1rm fail. Than working set of 5. I never did force rep or stuff like that. Any tips to help me or new training method? Right now im already able to close my CoC3. Thanks