I think every photographer ends up with a favourite focal length, their own sweet spot, mine is 23mm on a crop sensor or 35mm full frame, other prefer 355mm on a crop (50mm FF)
I suspect that unless you are doing a lot of single portraits, then 50mm on a crop might be a little long (tight) as Lefty suggested.
I'd suggest fixing your lens to 50mm for a couple of days (a strong fat rubber band will do the job), and then repeat the process with the lens at 35mm. Although you won't have the wide aperture of the prime it will give you a very good idea of what the field of view will be, and its limitations.