As per @lumpher are you sure it's carbonic bite and not just normal maturation?
Almost all IPAs better @3-4 weeks, allows any acetaldehyde to process, vegetals to subside, and some oxidation character is probably good.
I have a 15G Spike Solo and a 20G InfuSSion mash tun. Configure as a K-RIMS only when I want a high-gravity (1075+) 7.5G batch.
Have found that I just can't fit a big 25 pound grain bill (even as a thick mash) in the Solo with the efficiencies that I need to hit OG for 9-10 gallon preboil...
Steve - if you're looking for a little more explanation behind the calculations, BYO published a nice article in 2021 with some details (it is unfortunately behind their paywall):
https://byo.com/article/counting-calories-carbs/
Consider adding finings while cold and settling. Gelatin/Biofine/Silafine along with more time to let things settle.
It will definitely clarify with more time (although clear beer probably overrated).
Some sizeable bubbles in the line too. Is there a leak at the keg out connection? Or perhaps the limited flow restriction or larger line size is allowing CO2 to come out of solution while in transit.
Agree with @IslandLizard, would make the switch to 3/16" line and also check the gasket at...
I do not unscrew either of the posts or PRV in my process. I connect to liquid out when pushing out Starsan, then disconnect when nothing else comes out.
I stay connected to gas post under CO2 pressure for all of the steps, incuding when the keg is inverted and when I'm pulling the PRV (upside...
To clean I use PBW, water rinse, and then Starsan rinse. I agree leftover gunk in the keg could produce off flavors.
Not sure about the lactic/citric acid rinse - have never heard of that. Starsan is acid so I'm not sure it would be necessary.