Rubs the chainstay? What bike is it? I had issues with the 11spd low gear so removed it but that was the chain rubbing not the derailler cage or chainstay.
You can try moving it around within the spokes but also pull out/push in the plugs - doing that changes where it bulges so a bit of tuning should even it out. Then tape the bastard to the rim.
Only one point on the cover rubs the chainstay at a time (which varies), so it's not a clearance issue as such.
I can tune it out doing as you suggested, but it soon returns. Unfortunately taping it to the rim isn't a practical option, as the cover has to come off quite regularly.
That's all my tricks done I'm afraid. Some guys on the TTF said they'd drilled small holes and zip-tied the covers to hold them inwards towards the spokes but I didn't want to drill them.
Rubs the chainstay? What bike is it? I had issues with the 11spd low gear so removed it but that was the chain rubbing not the derailler cage or chainstay.
You can try moving it around within the spokes but also pull out/push in the plugs - doing that changes where it bulges so a bit of tuning should even it out. Then tape the bastard to the rim.