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The issue is that the squeak is related to the floating butt joint. I think I’m gonna try some daft micro drilling and syringing glue in. Above the tongue, the board is back cut to the shoulder (if that makes sense). I assume to help minimise any visible gaps when you knock the boards tight together. So my hope is that I’ll be able to get some glue into the cavity around the shoulder.
I think I’m still in the bargaining stage of remorse.
Nef
Normally my solution to this would be to water down PVA glue to make it pretty slack, usually a 2:1 PVA to water ratio then pour it over the joint and spend a good 10 minutes doing a kind of idiotic birdie song shuffle on the boards either side of the joint to work it in between the boards. Once this is done you can put as much weight as possible on the join to try and hold it all down while the glue sets. However it would be a lot of cleaning up on a finished surface and I'd also be terrified of doing that and not quite getting it all up.
Another thing you could try is dovetailing some 18ga pins in (assuming you have access to a 2nd fix nailer). By dovetailing I mean fire in 2 pins close to each other each at at an opposing 30 to 45 degree angle. This way the pins work together to hold down the board (assuming they both hit the board and joist). You will have to fill the holes and make good.