There's a few on there I would have to strongly disagree with. Hard Techno? Nah, slow and derivative, yes.

Virgil Enzinger- yes. One of my favorites. Interesting moody Techno.
Andreas Kremer- a legend in everything he does be it hard or schranz or whatever. Good music.
Glenn and Mattias- Agreed. I love their stuff. It's off the beaten track for me but it works.
Ryuji and brad lee- savage. Same goes with Paddy DSP. Marvelous.

I can see that there are some that apply to the Hard Techno tag- but there are a lot there that I don't understand.

A Paul for instance. I don't get it. I find it formulaic. Build ups of white noise that go up and up and break with nothing. Let me just add that this is no dig. respect to him for doing his thing and I'm sure he's a nice chap. (he's Portuguese, they are lovely people)

There's a good few that haven't made your list for now. But there is some very very new talent waiting to break that deserve a mention here.

Darren Gale.
Little Fella/Ben Deviant.
Luke Downie/Oris.
SPR.

There's a good few more. The above are the stand outs for me- watch this space too ;-)