Slant 6 power issues

Yes I have a timing light and I used it. And like I said before, if I adjust the timing at all from where it is, in either direction, it stops running good, so I don’t see how it’s “unlikely” that I have the timing wrong. And I’ve tried pointing the rotor at cyl 1 when the engine was at TDC but it still didn’t want to run until I advanced it.