All them screen shots look fine. If you have been playing with 68000 settings all this time, then you have not until now seen the full game. For 68000 cpu (Amiga 500) I had to make small cuts to avoid slow downs (less enemy's etc.).
with 68020 settings (Amiga 1200) you get:
...the true way to play my game.
as for game running to fast? maybe you had the slider set to 60 instead of 50? Oi 30 is cheating