2014 slightly shuttering at 1300 rpm, then goes away

Headgasket was replaced about 45K ago, along with various other services- EGR cleaning (although I didn't inspect that particular work), most filters, spark plugs, etc. Car has 305,000 and runs rather nicely except for this. I started noticing it and maybe thought it was my tires out of balance or something- but then playing around with a scanner app that shows RPM's, I have diagnosed and trialed my assumption many times- it runs a little rough at that RPM when warm. I was going to give the system a cleaning- EGR system a cleaning; as referenced in many place like here:

Unless there are other recommendations? Thanks in advance.

One thing I noticed, this scanner app indicates a misfire occasionally, but I haven't investigated what it is reporting. I have a scanguage 2 I can hook up. There has been no check engine light come on yet. I guess as long as the car runs fine, gas mileage is anywhere from 45-50 mpg, could one just let it go until the misfires increase or other performance is compromised?