Jay,
We run trips from Yeppoon into Shoalwater Bay all year round on 11m powercats. You need about 4 or 5 starters only (max 7). But we are totally weather dependent. If you are in Brisbane or reasonably close we make the go/nogo decision a couple of days out. Just an overnighter is Ok (or even a day trip) as it only takes us a bit over an hour to where you can start chucking poppers. We are not in the same class as Nomad, not even in the same universe, popping has been more a sideline with most guests keener on coral trout, nannygai etc. If you could organise to go with a couple of experienced GT guys that would help. Our weather in Feb is either perfect or crap.
Our recent popping has been motor into the islands, chuck a popper, get smashed, "geez is that all I get for a $35 popper" give up and go back to the reef fish.
Have a look at Keppelbayescapes website if you like. I would still strongly recommend going with a charter that specialises in this stuff first like Fiji or Nomad,... wish I could go on Nomad.