Like I said, it comes out of my hand. I'm trying to do negatives with the #3 because of problems I'm having holding my deadlifts at the top position. I just haven't figured out how to get it closed without it slipping. Right now I'm nursing a ligament/tendon injury in my left hand, so I'm not doing any grip work for the next 2 weeks, maybe longer. I'll try the two handed method as soon as my left hand is recovered.
Are you doing static holds with the #2 though?
Even if you're able to close the #2, I think static holds, followed by slowly releasing the gripper, is the best way to build up strength.
Instead of maybe 3-4 singles with the #2, you will be able to get in 7-8 singles, some of the regular closes, some of the static holds. Use the supporting hand to close with if you have to.
To improve your deadlift grip, look into pinchgripping, it will improve the grip immensly IMO.
What to do: Pinch two metal plates together, flat sides outwards and lift up. For safety purposes, lift off a bench.
I usually use 22 lbs plates (10 kg). You may want to start with 10 lbs plates or 15 lbs or 25 lbs, depending on how strong you are.
The pinch grip training isn't fun, but it's very effective for deadlift grip.
My grip is definitely not my weakest link, and when I step over that bar, it's good to know that I will have a solid pull, no matter what weight.
-Hedge