[Bobcat]

I think you`re backwards on your distributor springs .... too weak will not pull the weights back as quickly and the advance will not return to the base setting quickly . The stronger weights will pull the weights back quicker , but also change your advance curve .
Check the MSD spring curves for where the advance comes in with the various spring combos . If your idle is too high , then it may have the advance already starting to come in .
Personally , I think you need to put a light film of lithium base grease under the weights to free them up and help keep corrosion to a minimum .