I've played from 2nl, 5nl and I've been playing 10nl 6max for a while now. Before when I played, I was mainly playing for fun and not concentrating on my play and was break even over 55k in hands at 10nl. I really do enjoy reading and learning about poker and thought I should try and play less tables, think my hands through as carefully as I can and just try to play some sensible none tilting poker.
I've had some lessons from one of the cardrunners pros before and found it to be really worthwhile. Whilst I took the advice and made notes, I still felt when I was playing on my own, I'd make some very big mistakes. I'd do well, then if I got stuck, I'd open my range up, and just tilt off my winnings.
So I have been watching Climbing Mt Micro by Verneer and MdoranD's videos and making notes as I go through the videos and also pausing the hands and testing myself to see what I'd do in that spot. It's been pretty interesting to see the different play, but in many spots I thought of doing something similar.
I don't get to play too many hands each week as I'm working and can be busy during the evenings too. I usually play around 3 times a week, 4 tabling and play for around 2 hours. My last computer died and I don't have my old database, but I remember being -2bb/100 over 55k hands playing 8 tables @ 10nl 6max. I feel I've been playing well recently and 4 tables seems about right. I don't think I could play anymore than that at the moment.
Here are my results of 12k of hands at 10nl. I'm going to continue to watch the videos here and read the two plus two books.