I am having trouble setting timing with my new mopar preformance dist. with my old dist. base timming set around 12 and total was about 38 and i had about 15 in. of vac. when i install my new dist and set the base around 12-14 total timming at 3000 is only 24 went on up to 3500 and there was no timing change and vac. is only about 12 in. is 10 of cent. advance all i should be getting? all testing is with vac. advance unhooked