What do you weigh currently?
EDIT: Nevermind, didn’t catch it in the earlier post.
You’re 160 and 10-12% bodyfat now. You gained zero weight during the arm phase, which means your body didn’t have any reason to build muscle since you can’t build size out of thin air.
Most importantly, over two years ago, you were “currently at 162lbs around 10% body fat.” The reason you’re not seeing any progress is that you don’t know how to eat. Period. End of sentence.
Focus more on fixing your nutrition and less on “getting stronger on all lifts”. You say you gain fat whenever you put on size? I’m not sure that’s the case. At your current bodyfat, you should have some decent ab definition. You need to think long-term and come to terms with the abs getting a little blurry in order to see results.
Some “damage control”-cardio should be part of your muscle-building plan along with a dialed in diet, but the only reason why you haven’t gained an ounce of muscle in two and a half years is that, basically, you just don’t know what you’re doing. Either fix that or go ahead and “throw in the towel”. No skin off our noses.