When screening, I often find "bad soft" easy to spot. So my best tip would be how to spot a "bad soft", then self screen.
There are many levels of soft-sharp.
2. Slightly sharpened
3. Perfectly sharp
Combined these with jagged edges sometimes which leads to "bad jagged".
From a screeners point of view, I am looking for a crisp shot where the detail is as close as one (with 20/20 vision) would view it.
With this in mind, picking a soft shot is easier than you would think.
I recommend high percentages with low radius on the resize/crop image. But it's trial and error with USM
If you want consistently good sharpening, using a smart sharpening tool like FocalBlade. 9 times out of 10, it will given you good results.
Respected users.... If my replies are useful, then by all means...