Jacket Front-Back Balance

[Gerry]

I'm not a coat maker so my 'expertise' ends here I'm afraid. My gut feeling is that your remaining problem is due to your posture. In leaning back your belly is being pushed out and it seems like you're having to pull the fronts onto your belly when buttoning, which is lifting them.

So perhaps it's time to tackle the sway back draft now? (at least a lot of your balance issues have been sorted out in advance). Though best to wait for more experienced voices to confirm that.