I currently 8 table $2/$4 and make between 1.5 to 2.0 BB/100. I think I still have some room to improve. It actually didn't take that long to adjust to 8 tables. I only have one monitor, so I stack 4 on each side of my screen going up and down. Since I play on a party skin, they pop up when it is my turn to go. I have actually loosened up my play since starting to 8 table. I don't have any problems at all with the speed of the game. One tip: remember, you have 20 seconds (or so) to act before your hand is folded. Don't get into a panic b/c you have 4 tables where it is your turn to go on. Harder to learn than it sounds. I'm sure you're already familiar with the way 2/4 plays and with the number of suckouts so I'll avoid that. Kinda general advice here, but if you want something specific feel free to ask.

Lozing