0.82*14.7 = 12.05.
Ask 0.8 or 0.79.
1 degree at 4500 is insane on this engine. You need to be running at least 6 degrees at that RPM and even that's low.
Yet that is reality on 91oct
Especially when it gets hot..
Realistically, the only safe and sane solution is to dial back boost significantly to reduce max load.