One last bike change for RTP

I've had some soreness in my lower back and a little sciatica nerve pain on my left side. I'm thinking it's caused by the fixed gear and I'm going to change bikes for the RTP Saturday.
The Doctor would say spend some time on the Couch so that is exactly what I plan to do.
I changed the setup on my Couch a little and have it configured as a 69'er. This gives me a lower gear for climbing and still have it setup as a "dingle speed" with 32x20 and 34x18 so I still have a road gear and a climbing gear.
The steel On One fork will stay and the small block 8 tire up front will help with the rough stuff.
I rode this setup yesterday and it felt really good with very little pain. Still had some pain but it was from the ride I did Tuesday on the fixed gear.
Here's a picture of the Couch as I rode it yesterday.