You need to accept that your progress from here on out will not proceed at the pace it has. You can definitely continue to lean out but those PR's may not come like they used to, but that's no reason not to continue training hard and trying to set them. Hell, maybe you can keep that pace of progress up a little bit longer.
I've dropped a fair amount of fat since November while mostly MAINTAINING the strength I had. I'm setting some minor PR's, but I doubt I'm adding any muscle mass. And I'm VERY happy with that outcome, but I had to learn how to "let go" of this notion that I needed a 600 DL or a 550 squat more than I needed to shed my excess fat. That can be mentally difficult when you're used to getting stronger almost every time you step into the gym.
I can't advise you on how to get to single digit bodyfat, as I'm nowhere near that mark. I can tell you that leaning out at the big boy stages we are both at is primarily a result of what you shove down your craw, or more specifically, what you don't. If you haven't been losing measurable fat, either on the scale or in the mirror/how your clothes fit, well, you're just consuming too much. Simple as that.
It took me a little over a year for the lesson to really sink home, but you may need to choose your master. Is fat loss or strength/muscle gains more important to you? With your phenomenal rate of progress - let that sink in, because it is - I would simply adjust your calories down and continue lifting hard, be it on 5x5 or 5/3/1. If you keep getting stronger, great. If not, well, who cares if you're dropping fat and not getting significantly weaker?
If you haven't already, cut out any sort of crap. Alcohol, soda, candy, chips, etc. These are the no-brainer adjustments.
You said it yourself, dial it in man.