It's worthwhile to lay out all the assumptions in detail:
Positional structure is H --> V1 --> V2.
We know V2 has a lot of air in his river range. This is because of the following precise read (stated essentially in my OP): V2 does not slowplay his big hands -- he bets/raises big when he has 2-pair, trips, or greater. Therefore, V2 has no 6x hands, and no boats in his river range. His river range consists primarily of Qx, JT, 78 (which got there), and all possible combos of busted club draws.
I did not mention this read in OP, but I do not have any reason to suspect that V2 is a calling station -- his poor play is really only due to his tendencies to stack off with good, non-nutted, hands and the fact that he always buys in to this game super-deep (for 3k at the minimum). We can only expect him to have QT,Q9, or Q8 in this scenario (he raises QJ+ preflop), and I think he folds QT or Q8 at least some of the time.
Based on the above reads, we can expect V2 to fold >70% of his river range.
The further point, which is evidenced by the results of this hand, is that V1 is sandwiched between two players. It is reasonable for him to assume that both players either have draws or are trapping, and he has to be worried about being beat in either spot. We can expect a bluff to fold out the bottom of his range here -- this would be A
x
, and 9
x
. I have no idea whether we could expect him to fold his Qx.
I think the question as to whether this may be a profitable bluff boils down to V1s tendencies, as he is the unpredictable variable in the equation. We need the bluff to work >30% of the time -- if we can we get V1 to fold 50% of his range in this spot, it is guaranteed to be a solid spot to bluff. If that's the case, by basic probability we know BOTH V1 and V2 will fold at least 50% * 70% = 35% of the time.
Of course, none of this was going through my mind at the table -- I just made an idiotic play that luckily worked out for me. Still, I think this is an interesting spot which presents an opportunity for a creative bluff.
Last edited by aisrael01; 10-04-2018 at 11:43 AM.