Thanks rabiater. I see what you mean with reducing the aerosol pressure in the can and putting very little finger pressure on the cap.
I still have this feeling in the back of my mind tho, that I once heard that you could achieve the same effect by putting something in the stem, thus reducing the flow of the paint. Same idea, different technique.
But not to worry, I'll continue to experiment. If anyone else knows what I'm talking about, or has other cap modification techniques, feel free to add :)