Sounds like you need to get control of your toons down. There are a lot of movement intensive fights... almost all of them have something to interrupt/purge mixed with a dodge shit on the ground mechanic. I've done everything on normal and it wasn't that hard at all, granted I boxed in icc 10 and 25 so I was used to controlling my toons.

Heroics are actually challenging and I like that... Setup CC and Movement now and practice practice practice...