I wouldn't suggest dismissing the Plek service altogether, specifically if you have never tried it.
I strongly believe in the underlying technology, emanating from German engineering. Mentioning this as a German engineer of course.
I actually tried the Plek service myself on an Epiphone Les Paul Classic which I purchased from Thomann back in April this year and immediately fell in love with it, and just wanting to make sure I could get the best and overall maybe an additional 1 or 2% performance out of it, I sent it back to Thomann for the Plek service as advertised. My overall goal being to even enhance playability in terms of minimal string action across the board, if possible.
I had a nice chat with the person in charge at the Thomann upon my request on the phone, and he said that, upon initial diagnosis, some minor adjustments of the frets below the 12th fret might help. So I ordered the service, which came about at €200, all things included.
About a week later, the guitar was returned, and obviously came back in about the same shape as I had sent it in, except for some of the buzzing and partially dead tones about the 12th fret and upwards disappeared.
Should I regret spending the money and time on it so far, not mentioning all the efforts I had done before sending it in for the Plek service to get the setup correctly, including purchasing all and any kinds of Music Nomad tools and applying them to get the setup correctly?
No way, as people up around here in the very far west of Germany, situated in the Düsseldorf region, just between Düsseldorf and the Dutch border, like to put it. And if there is anyone from Bavaria out there disagreeing with it, he or she may hold his or her breath.