Our motorpacing usually is something like one of these:
1) speeds start about 25mph, and ramp up to about 32, with people hanging on as long as they can.
2) ramp up to a pretty good clip, and then the group will jump to the blackline and sprint a couple of laps to the finish
3) higher speed endurance for 20km or so.
4) Moderate speeds (in the mid 20s), have small groups (2-3) jump off the motor and take a lap.
Yes, you can do a little higher gearing (one cog tooth smaller) since it is a high speed event, and you are always drafting at a steady speed.