1) quitting. A question i often need to ask myself is "am i playing differently now that i've doubled my buy-in?". e.g seeing more flops, calling more draws. This is cash play, not a tournament, so the game shouldn't change, but occasionally it does...
Target amounts - i think these are a bad idea, there are too many things that are beyond your control. Target times (I WILL stop after 90minutes), maybe a good thing sometimes.
I think you should keep playing as long as you are playing well and the table doesn't suck.

2) Reading. Wow. I struggle. Stats help though, someone who is 13-3 won't have 2/7o, someone who is 70-30 is unlikely to limp aa. Etc. Good luck, and if you figure it out please let me know!