Strange. Why pocket deuces, why not aces, kings or tens? Do you have the impression that you win often with pocket deuces?
If so, you have this impression only because you don't have much experience.
Good luck
I wouldn't call it the best, but it's certainly great for hiding, just like all low pairs.
I especially like 77, I've had a lot of good experiences with it.
Have no preferences. Set mining works 1 in 9 times. And they tend to take big pots. Since I never limp I would openraise 3BB with any pair. Would call a raise with 22-88. 99 and better I’d 3-bet to 9BB. I play strictly 6-max cash games.