That's debatable. It's what I shoot for but I've seen better ST times with fu, focus, slash, shockwave, repeat and on scrappers, eviscerate has a higher than normal crit rate that can be leveraged against the Crit Strike's proc.
Gassian in Followup sounds awesome, but at 1 PPM, it's not. You could stick another damage proc in there and you might get more out of it but that'll be something to test.
Biggest thing jumping out at me, and others will need to speak on it, is Energy Absorption. That's where Ice gets its extra defense from. As it is, you'll be firing it off every 20 sec for almost 13 end. That's gonna eat your bar pretty fast.