I believe the ti advance setting was based on having a ti distributor, and using the high octane leaded euro gas available at the time. Maximum advance for ti in Haynes is 39 deg, which is a lot today.I don't see how too much advance would cause these symptoms, but from what I've read of late, the idea is to get full advance of about 33 deg at about 3000.
Fuel pressure regulator should be about 2.5.