Chris - You are correct in stating that the tighter pockets diminish the impact of pattern racking. Youtube is rife with examples of pattern racking and rack manipulation in Ten-Ball by the best players in the world. The "Random Racking Process" can also be used for Ten-Ball.
Right now in 10 ball the 1,2,3 and 10 are assigned a spot, the 10 on the brteak doesn't count as a win, so the ability to manipulate the rack is limited.
Paul, I hate to say it, but I've come to the conclusion the whole pattern racking thing is overblown. It's just another excuse when someone is losing.
I was in a tournament and the racks were plastic junk - impossible to get the first three balls to freeze because they didn't fit the rack. I was messing with a rack, flipping it, rotating it, etc. and finally found the 4 and 7 would freeze behind the 1 because they were less worn then the other balls, so I started racking that way.
I beat this guy 4 games in a row, and he said "no pattern racking". I politely explained the only way I could get a tight rack was to fit the balls into the right spot. Truthfully I was surprised he even knew the rule about pattern racking. He looked at me puzzled, like he was not even comprehending what I was saying. I was thinking "what advantage does he think I'm gaining racking the 4 and 7 behind the 1 on my own break?". I just said Ok and started giving myself crappy racks. I beat him 7-0 and He made about 2 balls the whole match and blamed it on me for "pattern racking".
If someone racks a "good pattern" against me and doesn't make a ball, they just gave me a roll. If they rack a "bad pattern" against me and I don't make a ball, they gave themselves a bad roll.
Truthfully, I recall reading that accustats did a big review on the 9 ball break. and guess what? The break is a disadvantage percentage-wise. Usually the breaker wins because winner breaks, so the better player is breaking more. In other words, if I break and run 20% of the time, my equally matched opponent is running out off my break more than 20% of the time.
I think you've got a good system to avoid pattern racking, I just don't think pattern racking is too important. If I were to make a 9 ball rule, I wouldn't personally allow the 2 or 3 to be behind the 1 in 9 ball, or at the back of the rack, but that's about it, mainly to avoid roadmaps - makes the game too dull.
Chris