I'm still on the 2.5, but I think I am making some progress. Once you hit the 2.5 grip, your progress becomes so minute and miniscule that you can't really visibly tell if you are closing it further than before. What I can tell you is that the No. 2 is like a fucking walk in the park now. I can "cold close" it, meaning I can pick it up and close it without warming up at all. That's a feat.
As you can see from my epic video on YouTube, the No. 2 used to be a big deal:
Not so much anymore. It's simply a cake walk. It's not *easy*, but it's absolutely no problem whatsoever now. I can hold it shut for > 15 seconds now - that's basically like holding 200 lbs from a rope with one hand and using only your grip power to keep it from slipping away.