I hear what your saying mate, i hate my galaxy s7 im stuck with lol, but i just dont see how its possable to be the tv at fault when earlier versions of vix run perfectly, in my case anyway as you know.
Not sure about the over scan issues the OP is having unless store demo mode is enabled like mine was....but he has noticed a big loss in picture quality too after upgrading.
What box do you own @champs4life?
Tweaking indeed helps in earlier versions but no matter what i try in 4.2 i just cant get a decent picture.
For example in 4.1 using the openvix red-HD skin i have to set video output to 720p otherwise i get heavy jagged lines, ok so that could be a skin fault...but in 3.2 i can leave video output at 1080p and the skin works fine.