That doesn’t seem too hard to solve. You just say that an h1-b job needs to be at the 85th percentile, salary-wise, in a basket of similar jobs by location/position.
That's what the regulations say right now - for each title, there's a prevailing wage level that DOL publishes and a H1 has to meet that wage level. It is however a single level across the country so it tends to be a bit on the lower side.
Actually it isn’t. “The prevailing wage rate is defined as the average wage paid to similarly employed workers in a specific occupation in the area of intended employment.“
https://www.foreignlaborcert.doleta.gov/pwscreens.cfm
