I am packing the cylinder.

I didn’t follow directions and the first cylinder I got was too big. I sized down, now when I start my session, there’s still a little bit where the shaft behind the glans isn’t touching the tube (I have a larger glans compared to the shaft) By the end of the session, it literally looks like a plastic tube packed with meat, there is no room at all, except maybe an air bubble behind the glans that can’t escape.

If my goal is primary length, with it being girth secondary, should I be keeping the same cylinder, or sizing up?