Yeah man, anytime you want to come down would be great!
As far as E. oophylax goes, I really don't know; Etnier and Starnes say nuptial males are available in April and May. I've never had any luck finding the guys, not that I've spent a whole lot of time looking. E&S show several sites in Whiteoak and Big Richland creeks (Houston and Humphreys counties), which I know some good accesses to; Birdsong and Eagle creeks on the other side of the Tennessee are also easy to access. That would also put us close to the range of E. pseudovulatum.
I'm just beginning to learn the darters. Spotting subtle differences among bluntnose populations is way over my head.
I have nothing but a good ol' hunting and fishing license for TN; I've never been accosted by TWRA for collecting nongame fish. The lower Tennessee is TWRA Region 1; the staff of that region are not big into the nongame stuff, so if you don't appear to be poaching undersized bass, they don't much care.