On the Microgaming network, a lovely message used to be displayed in the lobby description of Double Up SnGs (i.e. DONs). Alas it has recently been replaced by a more serious message, so let me quote the description that used to be given in 2016:
Warning: Double Up SNGs require advanced strategy and are not recommended for beginners. If drowsiness or pain persists please see your Doctor.
That sums up my attitude quite well 
I'd rather stick to the advice that IvicaIliev77 gave you in his blog - learn those game formats that are popular enough even at the midstakes, so that you don't have to relearn when you move up. Learning takes a lot of time and effort so try to avoid having to go through the whole learning curve twice.
Considering that you're into low-variance STTs, I suggest that you learn Pokerstars' 6-man superknockouts - they have a rather flat payout structure too but, unlike DONs and Fifty50s, they're loved by recreationals so there's more chance of achieving a decent hourly winrate ($50 an hour or so) there - a grinder who mixes the $25 and $50 stakes can get quite enough tables going at peak hours, or fewer but much softer tables at semi-off-peak hours. And surprisingly, the rake for specifically 6-man super-KOs is low enough (8% at the $1 level but 6% at $3, 4.8% at $5, 4.2% at $10, 3.92% at $25-50) unlike in Stars' other new games.
The fact that these STTs are hyper doesn't matter as much as you'd assume - the average downswing size in STTs in terms of BIs is inversely proportional to the ROI but the ROI isn't exactly inversely proportional to the speed - a hyper STT with a soft lineup can give a higher ROI than a turbo non-KO STT full of well-trained regs.
E.g. right now (at a semi-off-peak hour) the average lineup of a $25-50 6-man KO looks like 2 regs + 2 semi-regs + 2 recs to me (let Stars regs correct me if I'm wrong), though I don't really know who's a reg and who's not because I don't play at Stars almost at all - I've simply scanned the lobby and seen how many tables each player is at - and this kind of a lineup is already considered soft enough for the midstakes considering that Spin & Gos stole almost all the recs from STTs in 2014 and 5-6-reg lineups in 6-mans weren't uncommon.
Collin's video on 6-man KOs is a decent start, but there's not much theory on them yet so you'll have to work it out yourself with tools like Holdemresources Calculator. However, when you do, you'll start earning decent money by beating recreationals as well as lazier regs who don't use their own brains and can't play well because no coach has been able to spoonfeed them with precalculated strategies.
![:]](https://forums.pokerstrategy.com/wp-content/uploads/wpforo/emoticons/pokerstrategy-legacy/basics/pleased.gif ":]")
Guess I should more or less solve my tilt problem until then lest I shock everyone following the stream with my outbursts on the donkeys 
