(MONK) The scoop on AC loss after 14 stones

[Bruman]

FWIW, your weight limit changes. From the wiki:

The exact amount is 18.9 at 55, and 22.9 at 60.

Before 55 it's 14.

But yeah, as to how much per stone, no idea. The client doesn't report AC correctly at all, as you stated. It even thinks our weight limits are different.