I have been running Shoshone about 2x a week. I got stuck at Tombstone at 1100 two weeks ago with a 16 ft Cat. I ran Tombstone river right and the middle back bar (between the tubes) got stuck on a pour over rock.
When I run the rapid just right of the Tombstone rock, I haven't had any issues. Just make sure you are able to get over and make the move just right of the Tombstone rock.
If you have a bucket or self-bailing boat, you should be okay even at 1100. I doubt you will get stuck on the rock I was stuck on with my Cat.
I would do the Colorado river over the Roaring Fork.