form and function. If you are going to be on looser dirt roads then putting more meaty tires on makes sense and will be more fun to ride on, but if you are on hard packed stuff and pavement, slickish or slightly tready stuff like you have is still always going to be the best overall option.
I don't really get what you are asking, or wanting, as you know the surfaces and we can only guess.
in the end, its going to be up to you and how you want to put a priority on how the bike looks and rides.