U get passively 25 or so to acc as u get GF skill, not as part of trigger. Prolly it was changed - didnt lvl up WC on X yet. Also u can proc GF with normal bow shots. WC is 'archer' here

according passives and other stuff, they work mathematically correctly. mystic movement provides 25% aspd to mystic classes and light/heavy armor mastery do the same,thats why u cant see diff (empty armor slots are considered as light armor)
Mass abilities are for OL, not wc.