Wait until you're at 110 or so to eat the Alacrity scroll.
Also, the level 3 Throwing mastery is usually pretty cheap. I personally consider it to be one of the better masteries in game. Elemental fury is a very good mastery ability to keep up whenever possible and the passive Warrior bonus is very good.
Another suggestion, not sure what your throwing speed is at... but boost it up so that the more hits you get gives you more chances for gains. Eat some potions and get the SSI town bonus.
Good luck!