The answer to that is going to vary as well. Last year, we had nice rock in the Patapsco River. I was using inline planers doing 3.5 - 4 mph
If I'm targeting blues; we run 4-6 mph
If I'm targeting spanish; we run 6-9 mph.
However
We were running 8 mph last week (targeting spanish) and caught rock, blues, and the big Redfish
We all tend to overthink this "fishing stuff", and we are constantly reminded that we are not that smart
We have all been there saying; "Well that didn't work out the way I expected!". It's those days on the boat that make you a better fisherman
Adapt and try new things "on the fly" and your days of "catching" will improve. There were many times on the charter (especially in the late fall) when you could see the fish on the meter, but had either a hard time reaching them (down deep) or encouraging them to bite.
Patients and Frustration are two words in every fisherman's vocabulary
5th