Possible POB bug? - bow mastery + faster projectiles

Guys, am I missing something or?

if i take bow mastery which says, that increase and reduction to projectile speed also apply to bow dmg, with faster projectiles that should be 29%+79%=108% dmg increase BUT in POB awakened vicious projectiles gives me double the dmg buff of faster projectile gem, even though vic projectiles gives only 10%+60% = 70% ....faster projectile therefore should give 38% more dmg over vic projectiles.....anyone has a clue why POB says otherwise?

With damage figures in PoE "Increased" is additive and "more" is multiplicative so the vicious projectiles will always be worth alot more damage.

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gladiatorpie wrote:

With damage figures in PoE "Increased" is additive and "more" is multiplicative so the vicious projectiles will always be worth alot more damage.

thx i knew i was missing something obvious