What are you all doing in the absence of note/reads in 3bet pots versus the following villains:

You have been dealt JJ in a blind:
Assume effective stacks ~100BB; Caller OTB or in SB is TAG who you know is mainly calling with mid-low PPs and SC's or AQ/KJs+ type hands; Your image is 22/18 TAG and you have been 3betting AQs+, TT+, some SCs, and the occasional junk IP.

2 folds, CO raises 3-4x, BU/SB calls, Hero 3bets to 15-16x, CO pushes, Hero???

Now what are you doing versus a 35/11 type CO raiser?
What about a 24/20 TAG?

What if villains above 4bet to 34-36x?