WHAT!!!!
Don't 3 bet, and snap fold. You know his opening range is snug. We're always dominated in this scenario. In general, you want to 3bet bluff people who open wide and will fold all the trash in that opening range. If the regs you're talking about are tight, then they won't fold often enough, making 3bet bluffing less appropriate.
I really recommend you get an
equity calculator. Play around with ranges... run standard spots, and figure out just how low down the totem pole A5s is.