Regarding the supersampling option in 5.50, I noticed that it seems to negatively impact performance for some games where it probably should not.
Unfortunately I don't have any equipment to test, but here's what I've noticed over the past couple of weeks:
Grand Theft Auto V (Online Mode) - Suffers from hitching or stuttering. This already happened before, even with Boost Mode enabled, but the issue seems worse now with supersampling enabled. Disable supersampling and the game returns its previous performance. I found this odd, considering that GTA V does not support resolutions over 1080p on current gen consoles.
Gravity Rush 2 - This one surprised me, as GR2 supposedly already supported supersampling. I hadn't played the game since the update to 5.50. I decided to complete some treasure hunts and challenges. The game felt more sluggish than usual and I ran into what seemed like frame pacing issues in certain areas. Most notable were the forested areas with complex geometry. Texture pop in also seemed worse. The fan throttled up indicating that the the PS4 Pro was working harder. I disabled supersampling and everything returned to normal. The fan speed was quiet, controls were more responsive, and the frame rate returned to its relatively rock solid 30fps.
As I said, I don't have the equipment to test, but it might be worth checking into.