Hrmm.. could be. My silks never had an issue with ramp (I always spin the mob)in HoH and I don't use them in T5... so dunno. I try one today and see how they last.
Spining the Mob has nothing to do with Ramp.. Tho you can always leave your casters out of the ramp range. But this will not work with Coral in T5 as they resist all range dmg.