Based on that one brake not releasing I'd say you're problem may be rooted in something to do with the actuator discs. One thought is that one or both of them have worn in some way that's left a depression in one or more of the ramps deep enough to bind one of the balls and keeping it from returning. In that case, you might want to look into having yours machined/refurbished by OEM as mkirsch described. I don't know if their setup is a core swap or if you get your own back, but it might be worth considering.
It could also be some excessive wear on the spline of your bull pinion that's causing one or more of the actuators or friction disks to bind. Having to back up to get it to release makes that real possibility, too.
In that same vein, do you have it adjusted just plain too tight? Whether bands or discs, the recommended method for setting up and matching brakes on the letter series was first to set up the pedals for both brakes for an equal throw. Then jack up both sides of the rear to get the tires off the ground, start the tractor, get the wheels spinning in third or fourth, then apply the brakes (pedals latched together). Adjustment was to SLACK OFF the one that stopped FIRST.
One other thought, and I'm goin' out on a limb a little here, is a question. I'll assume you cleaned everything up the various times you've had it open. Did you lube it when you put it back together? you really don't want much of anything more than a light coat of graphite in there. Anything more than the lightest coating of oil or grease (yo don't really want much of anything called a lubrcant near your brakes anyway) will draw dust and clump up and interfere with correct operation.
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