I disagree about raising preflop with middle pairs. Yes, you are ahead. But your set gets the most value when it hits in a multiway pot, especially if you hit the rare but stackable full house you will want someone else to have trips. By isolating people you have a lower chance someone wants to play with you when your set does hit. I want to play pairs for stacks to hit sets and so I agree with your raise on the flop, but I have made a lot more money lately calling with pairs to get into multi way pots to get paid.

one problem with lower connectors also is that you have a higher chance of losing to higher flushes and straights. Don't play for stacks with the "idiot end" of a straight or with a low flush unless your read is pristine. Also, beware of re-raising high bets on the river with an idiot end or low flush, as often the only caller has you beat.