Outboard VS I/O

Aside from the increased fuel consumption issue with an outbard, how do you troll really, really slow for striped bass with an outboard?

My I/O idles at @ 500 rpm and I can go about 1.5-3 mph. 2-strokes usually idle much higher at @ 900-1000 rpm......How do these outboard guys do it? If the bait moves too fast it does not go deep enough and also a bass just does not seem to want it if its too fast.