Only vac advance affects Rotor Phasing, mech adv or initial timing does not. I would highly suggest modding the reluctor as opposed to altering the cap which will cause problems as that (2 side clips etc) is a flimsy system). I would just drill another roll pin hole in the reluctor & you're all set on RP then if that ain't it then we can continue on. How far is the RP off now?