I've been checking in and keeping up with the conversation from time to time, but I have been very busy the past few weeks and am just now getting around to respond. Thanks to everyone for your opinions, I will read over this thread many times and try to gleam insight from it.
Obviously my wife's opposition to my desire is a big hurdle and an honest struggle for me. My faith is being tested as my worldview has grown, because it has made me question so many of my suppositions about the nature of marriage and family, whats possible there, and of God's will for my life. It has been a difficult transition because I have mostly gone through it alone. I have so many questions going through my head and no-one to talk to them about honestly.
I do find substantial drive as a man knowing that polygyny is a virtuous practice in the eyes of God. All the extra energy I feel I have had has to go somewhere. So I pursue things like fitness, career advancement, and general productivity.