Sausage (I'm gussing that's not your real name),
Very glad to hear you've found the problem. Now for some nail biting regarding the internals after 20 miles on limited flow. Where you can, force in some oil, foe example, at the rockers. Thats the obvious place I can think of just now (I' in an airplane on the tarmac). I would recommend waiting until you hear from others about other ingenious oil injection methods. It would be a pity if you were just at the last point of residual oil endurance and, then, things went bad just after startup and before full flow. I hope this doesn't sound too gloomy, but if there are easy precautions to take, short of complete disassembly, that's what I would do.
I look forward to hearing about succesful reassembly, a delightful stream of oil spraying from the top of the tube in the tank and your enjoyable riding.