On the Fly is great.
Start parallel as you have, then adjust back of arm up, speck by speck, listening for any preference, particularly high frequencies.
Your cartridge should have specs for it's VTA, look up the related Stylus Rake Angle SRA which is the true goal.
It is more important to get azimuth and VTA correct for advanced stylus shapes. What stylus do you have?
Start parallel as you have, then adjust back of arm up, speck by speck, listening for any preference, particularly high frequencies.
Your cartridge should have specs for it's VTA, look up the related Stylus Rake Angle SRA which is the true goal.
It is more important to get azimuth and VTA correct for advanced stylus shapes. What stylus do you have?