If you're a Harpers Ferry guy, it's been a tough year! We need that river to drop.
Re your question, you will find a variety of opinions, of course, but of all my lines (floater, intermediate, sink-tip, full sink or sinking head), I use my intermediate the least. For my 8-weight, the two lines I can't live without are a floater and a 250-grain 25- or 30-foot sinking head line (others prefer a 300-grain). I use that sinking line as my go-to for the shad run and in the Bay and it goes on most trips with me.
For what you are describing, though, I'm not sure that's the fit for you. If you are talking smallies down deep around where you live, I think maybe more of a 15-foot sink tip would be better.
You will find other opinions, but I really do not use my intermediates much. In the rivers, for the need to get down deep, in my opinion, they don't sink fast enough and the current quickly has them out of the zone. And in the Bay, I either want to be on top, or down too deep too fast for an intermediate.