Thanks for posting the closeup. I see now you do have the maximum length. Suggest you add the Reese 4" offset ball then. That will give you another 4" back.
Also, you may not be aware that Andersen made a slight change to the design and they now ship what many refer to as the "Ultimate II". It's easy to tell the difference. Yours has a single triangle logo plate that's at the front of the frame and faces the cab when your hitch is installed. The Ultimate II has two triangle plates, one on each side of the frame when installed. The new design includes the funnel ring for easier hitching. But what's most relevant for you is that their design change also moved the top ball about an inch or two further away from the cab.
The Andersen Ultimate is sold with a lifetime warranty. I suggest you contact Jason at Andersen and have him look at your video. Andersen has been willing in the past to swap out for the newer model as a warranty exchange. You may find that a combination of the new design plus a Reese offset ball is all you need to get the 90deg turn.
2016 Wildcat 295RSX - 2015 GMC 2500HD DblCab Duramax/Allison 4x4 Z71 6.6' Bed
Maxxis 16" E; Ride Rite AirBags w/AirLift 1 wireless compr; Adv.Folding 4 Cover Andersen Ultimate II Aluminum 5erhitch on Reese Flipball w/Curt 4" offset ball LCI Ground Control 3.0 4pt + 2pt Elec.Rear stabilizers; 3 Slidecovers; 10ft. Portabote 6000# Dexters; mor/Ryde CRE3000 w/HD Wetbolts; King Dish Tailgater; 5hp Outboard Dual A/C; Furrion 48 Rear Camera; Champion 3100 Inverter w/Extended Run