Hello, happy to be helpfull, btw I am not a native english speaker so I hope that I am not too hard to understand. I wanted to add that alacrity seem to works strangely with the GCD, when using instant cast ability alacrity doesn't change the GCD, it stay 1.5 second, however if you have enough alacrity to lower the cast time of an ability bellow the 1.5 sec mark then when you use that ability your GCD is shortened to mach the new reduced cast time, that is why it cause so much synchro issue with proc cooldown
So far alacrity seem to be purely a PvP dps stats for when you want to unload your entire ammo reserve as fast as you can for burst damage.
Still, I am angry at bioware for puting that 4% alacrity talent, it will seriously hurt the dps for new player who aren't as knowledgeable about game mechanics. they will think it help them when all it does is makes them miss important proc :/