Hubby and I CCed the Shield for a couple of years with the AG CT-2 & 3 at 4 o'clock. We both dialed back the lumbar support extension in the car seats to maintain comfort.

We now CC double-stacks and had to dial the lumbar all the way back.

If your particularly sensitive, you might try one of those add-on cushioned seat backs, and open the seam to scoop out the foam behind your right hip.