if you add 10 cm it doesn't help. All that will happen is that VAR will be asked to judge if someone was 10.1cm offside or 9.85 cm offside.
The way to solve the problem is to stop measuring exactly. Either there is a clear and obvious mistake WHICH COULD HAVE BEEN PICKED UP BY THE OFFICIALS ON THE PITCH or VAR can't be involved. My shouty bits.
Either that or change the offside law completely, eg stop measuring at the point the ball was played and instead at the point it was received. Not sure that is a particularly good way forward.