900 is double stacked res everywhere (maybe not a couple slots), it's a shit ton. You're better off focusing on getting your damage up imo. You'll be standing around packs for less time if you can kill them faster
You should be able to stand in plagued just fine, maybe not desecrator though. If you're willing to, switch to transcendence and spam mantras every 3s. It heals for 3k without any additional lpss. With the right equipment (as in perfect) you can get that to heal to as much as 12k health each refresh. That's a route you can take if you aren't interested in LoH. Equipment is really competitive right now.
I actually just recently geared about 75 LpSS into my gear so I can get rid of Transendence in place of The Gaudians Path for more Dodge.
Another 300 or so LOH would be easy. I just need to swap out one of my weapons for another with a socket. I already have the gem needed. I would have about 990 LOH after that. If I get better gems (plan on it anyway), then I would have about 1390 LOH with 2.2 APS.
I completely agree that I need to get my DPS up, (which won't be cheap). I sort of got angry at the enrage timer for belial because I felt like I was able to take him down before. I'm not so mad anymore. It forced me to get almost 19K DPS before hitting up Act III.
The one positive with the IAS nerf is that I've been able to gear my monk rather cheaply to get to where I am. I feel like I can continue on through inferno with my build and some improvments. It might not be as fun, but the gear pices aren't as intimidating as CRIT% and CRIT DMG%