In my experience in playing on stars, with a limited Br the easiest most mechanical grind would be to play hundreds of the 1.20 single table sng's . They are non turbo and they qualify for the weekly sng battle of the planets leader board. If you check out the promotion all you need to do is to make it into the top 100 and you get a weekly bonus.

I agree with everyone in saying that 2nl is very beat able, but it sounds like you've had greater successes in tournament structures. This may be a good way to increase your BR and experience with the lowest variance since each sng will only represent the 5% of your BR. Where in the 2nl game a max buyin will rep 10%+.

I believe it is one of the lowest variance games, although your profit may be minimal it will give you a ton of experience in seeing hands. and your success will be easy to track, once you start getting on the high orbit leader board that weekly bonus will be huge.