I hate to pop your post Chadeffect, but tubes do work well with some panels. I'm using Rogue Audio mono blocks with my Apogee Duetta Signatures with "great Results"....better than: Krell Ksa-250, Krell Kav-500, Bat VK-500, Pass 150....and a few others.
Your Apogees are not set up properly...this could affect your opinion to some degree?
Dave