About the throat space, and losing room each time you roll the quilt....You can buy a kit or make one yourself - Sew-Krafty sells one to fit the Inspira frame for $99; I quickly found YouTube videos for how to make them for wooden or metal frames.
I have the kit from Sew Krafty and it works well (I didn't want to be waiting around waiting for 'you know who' to figure out how to make something like it!
Instead of conduit, I bought a top rail for chain link fence. I could get the right size and it was much more rigid so I don't have any sagging (my frame is set up 10').
It does make a big difference. Happy quilting :-)