Acearan

ok so i havent had wow for a few days, dont even ask..., and ive been doing alot of therory crafting. Atm i have a 2.03 cast time using the badge xbow and the 27 haste rating. When i herd about the 3:2 macro i kinda blindly started using it, but i did test it. my question is that is there a point when a 1:1 is better? im planing on stacking haste to a point, and im wondering if at a certian point if 1:1 or even 1:1.5 is beter than 3:2 thanks.

EDIT: another quick question reguarding QS proc. Should i switch to a 1:1 for this? it will put me down to 1.73 i think when active.