I fish the shenandoah river in frederick county va and the potamac is real similar,i use senkos,tubes and plastic jerk baits and usually do very well.
I make my senkos heavier than stors bought so i can get them down in the rapids and swifter waters,thats one of the many pluses for making your own baits.
You'll find that the members on this site will answere any question you have and be as helpful as possible. And im hoping one day soon do-it will release a madtom and hellgramite mold. They do produce quality products. Jay