Hello!

I am looking at covering an aluminum tube rib wing, and I am trying to minimize the inter-rib sag as much as possible.
I am currently very uniformed about the fabric covering process.

Is there any way to reduce the sag between the ribs after the fabric has been heat shrunk?
Does the ammount of sag depend on the type or weight of the fabric?
Or would the only way to reduce the sag be to cover the leading edge with a rigid covering such as sheet aluminum?

Thank you