A radius drawn from Donelson buys clicks you cannot drive to by Thursday
Distance targeting shaped like a circle ignores both the county lines that change the buyer and the drive times that change your margin.
Draw a radius around your shop and you will pay for searches in places your crews avoid, at hours when the drive eats the day. You will also pay the same price for a Murfreesboro click as a nearby one while earning less on it.
Target by county instead. Davidson, Williamson, Rutherford, Sumner and Wilson each behave like a separate market, and Metro Nashville being a consolidated government while the others are not is part of why the buyer differs at the line.
Set separate bid adjustments per county based on what those jobs are actually worth to you after travel. If Williamson work carries a bigger average project and a shorter drive from your yard, it should not be bidding at the same level as a market two counties out.
Check location settings carefully. Platforms default to serving people merely interested in an area, which in a city with this much tourism and relocation traffic means paying for searches from people who are not here and not buying.