On feedback devices like resolvers, especially single speed resolvers, generating an electrical angle from a motor with a high number of poles can result in fairly wide discrepancies at each pole pair lockup. Just imagine the 360 degrees of output from a single speed resolver as 360 counts, then divide that by the number of pole pairs (18 for example on 36 pole motor). That leaves us with only 20 counts to interpret into a full 360 degrees of electrical rotation. There simply is not enough resolution to get accurate electrical angles at that high number of pole pairs.
We are working in our software and hardware to offer a better solutions to this problem. For now, you may find using the standard resolver angle instead of the electrical angle is a more useful approach.
Make sure that the motor is receiving close to the full amount of current listed on it's nameplate. On high pole motors this current is also often very high. The TI-5260 lockup switch and PSP-2010 DC supply are only rated up to 10A. If you need more current from a bigger DC lockup supply, please remember remove the TI-5260 lockup switch and instead connect directly to the motor.