heres a wrenchy one for you.
the return pipe to the MC is a touch dicey....
while all the shoes are up under pressure the fluid returns, once system pressure drops low enough the rears continue to release normally and the fluid transfers to the front till the shoes touch just enough to self energise.
to test it...
get the fault to occur
apply the brakes hard
wind the adjusters up tight
release the brake pedal
crack both the front brake pipes, preferably up at the 4 way joint that connects FL, FR, MC and Rear line.
wind off the snail cams
it should drop some fluid and if the brakes begin to improve we have an answer. If it doesnt and the brakes remain tight on the front begin cracking the lines closer and closer to the cylinders.
IF all the lines from the 4 way check out to be sound then the most likely culprit is the line from the MC to the 4 way or the fast fill valve.
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