Well you're further ahead than I am but here's what I can tell you:
1: to use the 3:2 macro, you'll do well to keep your attack speed below 2.1. I find that even with lower latency than you I can still chain steadies frequently at that speed using the 3:2 (manitou's) macro... though this might well be due to inconsistent lag. I find that something closer to 2.0 works better than 2.1 so go ahead and pack on a little haste gear to hit that speed.
That's really all you'd need to change I think. the beauty of the 3:2 rotation is that regardless of haste, your rotation shifts from 3:2, to 4:3, to 5:4 to 6;5, etc. until you eventually hit 1:1 at like 1.67 speed or something around there. in otherwords, one macro will take you from 3:2 to 1:1 as you recieve and lose haste procs throughout the fight.
No macro switching, nada.
Pop the bracers on and see what your speed becomes. if you need more haste... the za cloak or badge axe will help a lot (as you need that haste at this point). 2.05 is a good benchmark speed to shoot for I think, but ultimately play with whatever haste gear gives you the best results IN RAID!
Here's manitou's macro and how to set it up:
Manito's Modified 3:2 Steady Shot Macros - INFORMATION STICKY