That might say as much about the buyer's shaving technique as about your honing skills. If you want your honing assessed, the only viable way is to send a razor to an established shaver, preferably one that has extended honing experience.
The general approach on SRP is to make the razor as keen as possible on the lower and medium grits (for razors, I'm calling 1K low and 4K medium) and next just polish the scratches with a minimal amount of work on a finer hone.
While that approach definitely works very well, and is probably the quickest way to produce a good edge, it's not my personal cup of tea. The dreaded "overhoning" issue, which I believe is a collective and somewhat ambiguous term for several possible edge problems, is one of the risks of that method. Aiming for maximum sharpness on rapid (and consequently aggressive) hones, can cause instability of the very edge. Depending on the hone, the applied pressure, the number of laps, the steel of the razor, these issues can take a weird turn during final polishing.
Often the polishing hone that revealed the condition is blamed for the problem.
Personally, I take a more "sneaky" approach to honing, progressing more gradually to the desired edge keenness. This means that I do far more laps on the finer hones than what you'll mostly read here on the forums. It takes more time, and it doesn't discharge you of hitting an certain target zone during each honing stage, but it leaves smooth very keen edges, and I never found any adverse effects.
The approach you described in your post, resembles a lot what I do if I take the Naniwa (chosera) route, although I don't count laps.
After the 16K, I really recommend just stropping and a shave test. This edge should shave completely effortlessly. Let's say that 95% of the edge quality should be there. Perhaps even 100%, because the last 5% is all about personal preference. Some like the brute force of a 0.25 micron diamond spray. Some like the feel of CrO. It's final tailoring, but I wouldn't recommend it for saving a failed honing attempt.
Is it possible that those razors have a slightly smiling curve at their tip and toe? You might want to catch up on a few honing stroke variations to deal with that.
Strokes for honing a razor - Straight Razor Place Wiki
The only real benchmark should be your own shaving experience. Raw sharpness is not the only attribute of a straight razor's edge.
Best regards,
Bart.