Thanks Foo. The waist is really the one part I the shirt I really got wrong, took in an inch from my first shirt, but in retrospect it was probably just right the way it was.
I think I understand what you're saying about back balance, I'll mention to Luxire and see what they can do on my next order. Could the sleeves also be bunching because they are just too long?
The bunching is localized around the back side, around your elbow. That's what makes me think it's the shape/balance that is wrong, not the overall length.