Great post. I have two ideas I'd add.

1. I don't think 30 BI's is enough when you move up later, say to 100nl and above. I'm a bankroll nit, but most people agree you need more protection the bigger and less replaceable your bankroll is. I could rebuy a $500 bankroll pretty easy. Not so much with my current ~ $3k roll. So you play extra careful in terms of BI's when you win your way above your ability to replace it.

2. You can put more than 10% of your roll in play at once multitabling if you use the 30+ BI bankroll rule. I don't advocate playing mass tables at the micros, but I would suggest buying in full on any tables you play. Buying in full on 4 tables w/ 30 BI's behind shouldn't be a problem, as long as you can quit if you start spewing.