Yeah, I actually felt a little cramped in the setup before. I mean it was ok, but not great so I'd been planning on dropping the stem a little and I bought a longer stem when I bought the threadless converter, but I wasn't expecting the threadless converter to be so short. The stem is only 6 degrees so flipping it won't raise it a ton. I'm sure the adjustability of the Soma you suggest would probably make my life the easiest, but I've already bought these parts (and have used my current converter stem, so I can't return it), so I think I'd like to try to make a go of it with these parts.
I think the current setup might work, but I'm just not 100% sure and didn't know about running the brake cables because I didn't know if it was better to set it up at the tallest and then cut the housing if I want it shorter or what. Not a huge issue, I just read from Sheldon's website that you don't want to have your cables any longer than they have to be.