Currently I am a Jugg OT for our 8man (10/10) Nightmare progression ops group and I am 14/27 Hybrid tank/dps spec and I haven't played in the PTR, and probably won't.
My question for you is; what exactly changes? Where are you putting the points in Immo that you originally had in Veng (and where did you take points out). I believe that Hudde (if intercede is used properly) is an amazing tank ability, and I could do without the Force Scream crit and Impale DoT that both rely on using Impale frequently.
Another question I have is: How is survival with 18/23? Does it differ that greatly from 14/27?
Obviously Invincible is a must have for this spec, but with 18/23 do you drop the points in Huddle to pick up the extra dps boost? Or do you stick with Huddle and ignore the dps boost?
Also, with 1.2 right around the corner and BW really stressing how important raid mechanics are going to be, will this spec still be viable for OTs, or will I have to go full Immo for the added survivability/threat in order to progress in ops?