Hero midpos (360 stack) Semi-Lag image, I have been quite active since I have gotten alot of hands.
Hero opens to 12.5 with AsTs
3 Callers(1 Fish, 1 Tag-Shorstack and just TAG)

Flop 2s4x5s pot about 55

Hero x
2x
Tag Bets 40(Covers hero) He has been getting ALOT off good hands and every time I have seen him play he is there with something.
Hero x/r to 125 TAG jams hero Calls.

Ok, should I lead the flop or x/r? I was hoping the fish might donk since I have seen him bluff then 1 off the guys can call and I squeeze. The board SHOULD miss me alot but they have NOT seen me x/r at all so this should put me on a very strong range of overpairs+sets. I dont think anybody off them will put me on 2overs+nut fd so they might call with their own fd's.

Guessing TAG's range looks something like A3s,22-99,54,FD's and perhaps some A5s/56s. Calling seems bad as I can make him fold alot off his good hands. When he jammed I kinda gussed he had a set although he should show up with 6s7s/8s7s here sometimes.

Anyway is it better to lead the flop? Also what would you do if I lead out on the flop and got raised?