I gave this the benefit of the doubt, I did your spec yesterday and I'm in battlemaster/champion gear, and boy let me tell you, when you don't pop relics and expertise stims it's damage on actual GEARED targets is piss poor. I have nothing against AP but the numbers of a pyro build don't lie. I don't have to pop anything to see 3k+ damage with TD and RS on fully geared targets with the exception of tanks.
Even the added utility of Hydraulic Overrides is not as amazing as you'd expect, you are still going to fall victim to 50% of the CC type abilities in this game. I like the flamethrower buff and got 2k crits(unbuffed, because claiming buffed damage as normal is basically BS) on pretty well geared targets, it's just a shame that it is so situational.
I just wasn't impressed by anything, every skills damage just seems too low when compared to pryo, and I had a much harder time dealing with classes I would normally never even flinch at while I was an AP. It wasn't all bad though, it just proves to me that AP needs serious reworking for it to really measure up to pyro or even a shield tech hybrid.