Why don't you post some scores???
When i play i shoot all the mushrooms (almost) in the right half side of the screen, but i can only keep it almst empty to 40k+ or something like that, after 50k the game speeds up an it's sheer luck from that point on.. The flea speeds up!!!!
-EDIT-
I'm at the airport, waiting for my plane to London, where i will be for 4-5 weeks.
@Etienne; i havent forgot the Crazy Kong PCB i owe you, but ill send it to you when i get home