Yeah, I had the exact same feeling. Thok is one of the few fights that the tank cloak is really useful, but so is the dps cloak. The dps is definately an issue unless you overgear it. We killed it during the enrage on our first kill.
Double devo bop in insanely helpful. Lights hammer is imo better than both those though. We had the problem we would run into the 30 stack insta kill all the time though. So we had to tell our healers to stop healing at 27 stacks.
And yeah, do whatever floats your boat. There are so many ways to do thok. If solo tanking works for you than do it
We used a quite developed tank swap schedule to get maximum dps out of the 2 tanks we had. You can also do Thok italian style (a bit of a joke from our guild after seeing an italian guild whos name escapes me) doing thok with 1 tank and 4 healers.