I can't say I've ever done a shift kit before. Looks ambitious to say the least. I do have a link for a deeper pan though. Keep us posted on how it works out.
A deeper pan is a good deal. I think the best thing for the trans is the SCT3 and have the pressures and shift points adjusted. It can also be use as a tuner.
I used the shift kit they sell for the 5r55e... it is really for when you rebuild the tranny and not as an add on.....
The bigger PML pan is a great idea...
The best thing for the tranny is the XCAL it works the best..... Due to my converter and shift kit my Xcal had to be adjusted a lot to get it right due to the mods..