Dave, you should be able to get that up to around 200 -250 without too much trouble. The answer is, set the oil pump rich (ie the 28 drops) and check oil level in the case regularly. If you check before a ride and drain to the level plug, stop after a few miles and recheck. I do this every 40- 50 miles on a new motor, draining the level plug into a cup. Once you know that you are over oiling, you can reduce the oil flow gradually. It is very dependent on the oil pump, oil temp and your personal riding habits. I have found that oil consumption tends to drop off by/after around six hundred miles, I assume that this coincides with the rings having bedded in.
Bear in mind that the increase in oil useage with revolutions is not proportionately linear, as what may seem to be over oiling at 35-40mph will be just about right at 45-50 mph, but a short burst flat out will have the motor running dry in a couple of minutes. You should not be running flat out until you have a round 1500 miles on the motor, Jorgen Sundberg in Sweden recommends using a product with an ester as an additive during running in.
This video is a bit of fun, I DO NOT recommend synthetic oil for old motors, a do you own research please.
https://youtu.be/A-bU6SByP0Y