A 12 team PD would be good, but its the games series set up that's the problem, 33 just doesn't work, plus you could be away to bigger clubs twice in one season that you are challenging etc.
36 games right now is about just right, unless they did something like the SPL, (12 teams) then split and run to 38 games, but splits are not everyones cup of tea, not sure I`d like to see that return.