As some here know the wife and I just started pullin cranks in mid july. Thanks to this forum and the good people here we were catching limits by mid july- late september.
My thoughts are half what hotrod said, half what rees said. The beauty of trollin 1.5-2.3 mph is you cover ground. We learned that if we got doubles or triples I would check the fow and a couple points on land for a return trip. No gps. When we zero-ed in on these fish is when we started doing better.
We fish Sardis and have learned a few honey holes. If lez point troll don't put fish in the boat we angle over and troll to clear creek. Heck sometimes the best fishing is between the honey holes. I don't pretend to know much, just what worked for us.

