I’m thinking along the same idea. The front arm being hollow may be the culprit. I’ll be looking at what to use as a stiffening plate.I’m surprised I haven’t seen any after market strengthening sleeves pop up on eBay yet. If I didn’t have my warranty to maintain I’d be tempted to remove the front foam filler, grease the cable where it enters the AC body and file the arms with epoxy resin or silicone.
They do have a lot of flex the way they are now.