Matt,

Comfort and good sound are your two judging criteria. The roll you describe is doable (I use it sometimes), but you can also consider playing those three strings TIM. I do that a lot. It's unconventional to play the M on the 2nd string, but I find it easy and comfortable. If you do too, I recommend that. The way you're doing it is sometimes the better alternative (if for some reason you need to put in a note (M) after the first three, and then come with the thumb on note 5 of the roll). But whatever you come up with, weigh its do-ability against the do-ability of an easier alternative and consider whether the (ideally) better note choices are worth the extra effort to overcome the chance it won't sound good under performing conditions.

Good luck!

Pete