You guys are reading way too much into this.
The deep pan trick helps hold more fluid, obviously. The BOTTOM feed 700-R4 filter is better than the TOP feed 200-4R filter. This is where the confusion comes in I'm thinking.
Under hard acceleration, the fluid will naturally flow to the back of the trans pan. On the stock pan and filter this is bad. Since the 200-4R's filter is on the topside, it could cavitate the pump by drawing air; meaning it wasnt submerged in trans fluid. Thereby starving the pump of fluid and possibly causing damaged to the trans.
The 700-R4 filter prevents this from happening. When I bought my Art Carr pan from Kirban's, I had to grind down the four "posts" on the inside. That's where the 200 filter would have sat. You need to grind those away to allow room for the 700 filter to fit.
Use a 200-4R pan gasket with the new pan. 700-R4 gasket wont fit, obviously.
Setup should hold around 3 more quarts of fluid (+/-). I have this setup on my GN right now and have been 11.30s with no problems.
Hope this helps.
Scott