armor of courage is awesome for swarming, try using that instead of mantle on inc (if you're that high) then pop mantle when that fades (armor of courage & mantle on diff timers). Also, anguish BP clicky is huge too (get a 1200 or so heal most times you're hit for 1 min) with 2.0 epic. The only time i'll use valorous rage (when swarming) is with Armor of the Inquisitor & first spire (evens out heals/ac a bit). Awesome disc but my swarms lead me to getting an ass kicking from lack of heals if AotI and first spire/epic aren't up. Biggest thing i'm not seeing with your swarm list is 1st spire, epic, anguish BP (Dawnseeker's) and Armor of Courage.
if you're against a wall, have persistent casting maxed (or close) and using short cast time heals you shouldn't have issues self healing.
i do frostcrypt & can pull an entire room (15-20 mobs?), so it all depends on your hp/ac. I'm still trying to find a place with less pathing issues & lower HP mobs, however, i've been busy with HoT so haven't done much testing

. Until then i'm sticking to FC (15aa per lesson so far =/)