I took my Escape into Ford to have the fluid level adjusted to the correct level. I would have done it myself but I wanted it documented. What I found was that the level after adjustment was not anywhere near the correct level as per service bulletin TSB 09-20-13. I don't know how they would have gotten the oil up to 185 - 200 degrees called for without driving for several miles which they did not and I know they didn't put it in gear, apply the brakes and throttle it up to heat it up. I don't think many dealerships have taken it very seriously, for each of them this is a very isolated occurance. It is very difficult to arrive at the right level, A) It's hard to get the transmission to 185-200 degrees especially in cool weather and the fluid on the dipstick is very transparent and hard to read. What we are talking about is 1/2 a liter/quart one way or the other.
I have actually seen a 6F35 transmission disassembled on the bench (not mine). In discussing the overheating with the tech. we didn't see how an additional resivour would help, it would just provide more oil to spew out when it overheated. What is required is an auxillary pump to circulate the fluid through the transmisson as well as the cooler. On another note while looking at the transmission we decided if it wasn't for the overheating issue you couldn't hurt it, it's pretty well built.