Your transmission came off the production line on 16 October 2002 so it had all the final development fixes, including the stiffened A-clutch drum. I’ve just been looking through your post from the beginning. Although I realise this isn’t the main issue under discussion here, from the photo in your first post that looks like a 328 valve body assembly that you fitted as a replacement? Can you double check the number etched into the lower rear valve block on your original photograph as the resolution of the posted photo isn’t quite high enough for me to be sure? If it is a 328 then this is the wrong unit for a 4.6is, which has to have a 353 unit because the B-clutch and E-clutch valves are different. Your upper valve block should have ‘075’ etched/stamped on it, which is a further check.
Phil