I've been poker for a living for a little over a year now. I used to play NL200-NL400 HU and 6max on euro sites, and was making good money last year when the games were softer. Recently I've started feeling that NL200+ 6maxes especially are full of regs and just too hard to beat, so I'm in the process of making the transition to HUSNGs and HU cash bumhunting. I'm down 50-60k this year on drunken PLO shots and slowly but steadily reaching bustoville. I probably would already have arrived there had I not hit a final table in a $2500 buy-in live tourney a few months back. I don't want to get a day job again so I'd really like to start making good money again. Of course I could go and grind a ton of NL100 or something, but I want to try HUSNGs as I think they're a lot more fun and most of the villains are terrible. I'm not really worried about my winrate so far, I've got a decent ROI and I think I'm beating a large percent of the field in 55s and below.

But here's my question: I don't know what the hell is wrong with me but it feels impossible to put in a good volume of HUSNGs. I mean, obviously I think 4 tables is the maximum you can play at a time so you won't be able to play tons of games in a day anyway. But I mean on the mental side as well. I just play two turbo games at a time (unless one of the players is super predictable so I can just auto-pilot and start a third one), and after like 7 games I feel exhausted and in need of a break. It feels as if I had just ran a marathon mentally, it becomes hard to think clearly and if I continue playing I start making a lot of mistakes.

I've never had this problem before as I've always been a big grinder/multitabler. I'm still able to play almost Boku style 5+ hour sessions of 30 9-45man SNGs at a time with no troubles at all, or 10 tables of NL100 6max. Obviously, my $/hour is a gazillion times better at basically any other game than HUSNGs at the moment. At NL100 I'm running 6bb/100hands at a massive 300k+ hands sample, most of that 8-tabling (I think). I think that should make me about $60/hour + rakeback = $100/hour at least. In STTs and 45man SNGs I think my ROI at $16s should be around 5% when multitabling heaps, and I can get 30+ games in per hour = again I'm making something like $60/hour. But in HUSNGs... $33 avg stake and 9% ROI = I'm making about $3 per game plus rakeback = getting in maybe 8 games per hour = $24/hour total. And what's worse, I think one hour is the maximum I can play without needing a break, which makes my $/hour even worse.

Please someone give me good advice, other than "forget husngs and go back to cash games". I think I basically have two problems:

1) HUSNGs being mentally too challenging - I think it has something to do with them needing so much thinking compared to almost any other form of poker? How do you guys manage to play 100 games in a day?

2) Reasonable hourly rate - how high do you need to be playing to really make any money at all? Could someone post what's an attainable ROI at each level (Stars)? I play euro sites too and I think the games are softer there, but I don't like the structures as much.

Thanks for any help in advance.