Royal Purple question

I did a tranny fluid change this weekend. Couldn't find RP anywhere here, so I went with Mobil 1 Synth ATF. 3Liters (3.2Qt) as per:

"NOTE: Ford has come out with a TSB to repair the TR3650 transmission and after specific parts have been replaced the final step is to fill the transmission with 3.0 liters (6.3 pints) of Motorcraft MErcon ATF (XT-2-QDX) or 102 ounces." - Taken from Bullit Maintenance webpage.

Must say, shifts are noticeably better with the MGW and synth fluid. Haven't noticed much dif in the clutch.