I couldn't figure out why I had to put pressure on the inside bar to hold a line on some corners and not others. Shifting my derriere to the inside helped sometimes. Going faster through the corner helped sometimes too.
The rear tire was fairly new but the M3 on the front was worn down to the tread wear indicators. The problem went away when I put a new M3 on the front. The bike turns more easily and quickly and it holds a line beautifully after the initial steering input.