There are really no correlations to be had unless the obvious surface activty exists.
I currently own and use over 10 lines for stills and I plan to add a few more this year.
Basically there are two factors at play:
1. What level are the fish feeding/cruising at? To me this is the #1 goal...to find the level. If you are under or over your fishing will suffer. I have had days with floating lines where the mere weight of the hook meant fish or not---using a heavy wire got me too deep too fast.
2. What retrieve (static to roly-poly and all points between) do they want?
Then, you blend the two together to try and maximize the time your flies remain at the feeding level using the preferred retrieve. Add in a drifting boat and you have a third variable since you will be moving toward your flies so you have less tiem to allow them to sink or to retrieve.
I do not troll.
For starters I would be sure I had a floater, clear intermediate, Type 3, and Type 5 full sinks.