I would never reforge away from haste to anything else (like you did on your cloak, belt, and boots) unless I absolutely needed to for hit. I'd reforge crit then mastery to hit till you're at 17%, and then I'd reforge any piece that doesn't have haste already to haste till the 2589 plateau. I personally don't worry about that plateau and prefer to not reforge away any haste (even though I can't reach 3202 yet). I just like the way it feels better. My best advice is to try reforging excess haste to mastery one day and see how it feels for you.
The LFR Will is better than the Normal Insignia, so stick with Will.
Going by this weapons ranking list here
, it looks like the N Dagger/LFR OH is pretty much on par (or maybe a little lower?) than N Lightning Rod. However that list is based on a single target fight, so when you take in to account trash, or fights with multiple targets, the Dagger/OH combo should be better.