I did something similar. Had a Zesty 914 when they first came out with EI, and as a bit of a project I built a 29hardtail. I found it much more comfortable to ride, and found myself wanting to take it out, rather than the zesty. When I did take the zesty, it was such a drag on hills, and hard work on the going, I decided to bite the bullet, and sell it.
I am now an official 29er, having bought a better carbon hard tail, had a spesh epic over the winter, but just sold it, and have a carbine 29 on the way.
Had a spin on a friends new 26er the other week, and it felt like a bmx bike !!