I have no experience running protein feeders...but I noticed this is your first post and hate to see someone new reach out with no reply.
Maybe someone with experience on the topic will chime in? But I would assume the cost associated with running protein feeders (enough to make a difference) likely prevents many from trying it....also with CWD hitting in SW TN there is concern with concentrating deer in tight areas feeding from the same source.
I know several on here run salt & mineral blocks, loose minerals and trophy rocks but hadnt read anything on feeding in the off-season....most of the conversation is geared towards natural habitat improvements and food plots.
Welcome to TN deer!