If the flame burns yellow it means that there is not enough air or too much fuel. Cleaning out a jet would increase the amount of fuel making the problem worse.
I had an Atwood cooktop in my RV that started acting up. I also couldn't find any adjustments. If the cooktop is similar to what I had, there is a regulator inside the cooktop. This is in addition to the main regulator on the propane tank. It may be that the internal regulator is going bad.
I didn't care for the cooktop so I replaced it with a small residential cooktop.
Tom
2005 Born Free 24RB
170ah Renogy LiFePo4 drop-in battery 400 watts solar
Towing 2016 Mini Cooper convertible on tow dolly
Minneapolis, MN