Vern, it would be nice if you could get a couple more pics that were a lot more clear to see exactly what mods you do have........
First thing is you obviously have a lubrication circuit problem, the cooler line (circuit) enters into the gov support area by way of the inlet into the case, and then lubricates various bushings, thrust washers, planetary gears (splashed), clutches etc, etc by way of passages drilled down the output and input shafts (with one of the first stops being your chewed up output support).
With that being said, think of the low reverse drum and the output shaft in the support area as being like crankshaft journals and the output support like an engine bearing ....... needing some amount of pressurized lubrication fluid to keep a layer of oil between the individual components(not much pressure though, 5 to 30 lbs is all it needs).
Your comment about the bushings heating up and changing colors also points to this lack of lubrication, as does the trans heating up (no lubricating HOT components).
It also COULD be convertor problems (thats where the lube oil comes from)which possibly could be the metal particles, or they also could be from planetary's 'spalling' (galling)from lack of lube or even thrust washer/wearing of components.
One thing you mentioned was the epoxying of the governor feed hole in the support........ there are 2 holes in this back area of the gov support, if the forward one was epoxied that will definately be your problem as the forward hole IS the lubrication circuit for the trans ....... your pics (or it may be my eyes
)are too blurry to really see this area ....it almost looks like it may be epoxied.
In any case, (no pun intended) some more pics and more info would help to find the cause of your problem...... keep em coming