Lemmie ask you if you remember.....does one of the springs you have have a slot in one end? If it does, that might be your problem. That requires almost no RPM at all before you get some advance. If you have that, you need to throw it in the ditch and put one in there that does not have the slot. That was a leftover from the emissions days when these engines were anemic and needed all the help they could get.