Finishing leather edges
Looking great by the way so far!

Personally when finishing any leather edges, I find the tiniest bit of Eco-flow gum tragacanth (brand not specific but it's just the one I've used) with a quick 
hand burnish with a cloth gives the best finish. Yes, it's a lot harder and you need elbow grease, but I think it's worth it. I don't usually bother with edge colouring as I feel it doesn't much improve the look of the end item...

I'd also recommend spending some time burnishing the leather by hand just in general, using a cloth and light pressure but very quick movements over the edge you want to finish. Then try with different cloths, and dampen them a little, and then try with the tragacanth.

Hope this helps! Any other questions I'll try to be sure to come back and check if this helped. :D