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BTW, we're the two biggest stacks on the table, and there's approximately 90 players left with the tourney paying 180 - so it's very small increases in pay-out until the last two tables.

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This fact sheds a whole bunch of light on to the situation. You have very little to risk financially. It sounds like perhaps there is very little difference in prize money between say 90th (where you are at) and probably double your stack (say around 45th as a guess).

In this case you have much to gain and very little to lose by firing away. Hopefully you will get a call from a lesser hand. Even if you are behind, you have cashed and presumably made a small profit already, and you still have 4 outs twice for the boat.