I generally have my best luck trolling at about 1.5 m.p.h., but I constantly zig-zag and turn, which will speed up or slow down the lures depending whether they are on the inside or outside of the turn.

Another trick is to occasionally kick the motor out of gear and let the lures settle deeper. often when I put the kicker back in gear I'll get a strike.

Try using about 1.5 mph as a baseline, unless Easy Limits tells you otherwise. If he does, do what he says!