> a lot of the leveling data is subjective AFAICT and not based on cross company moves

eh? the leveling data is local to each company. within each company, of course it's subjective because ladder criteria are subjective. but AFAICT it's accurate. in general "senior" is 5 years at any company. senior means you have a 4 year degree and adequate work experience to have applied your book learning to a professional environment and so you are now adept at basic skills, advanced and current platform/framework/library/environment knowledge, know how to use many modern toolsets, have delivered software that has made it to the maintenance and maybe replacement part of the lifecycle. beyond that, some companies have more grades and some have fewer which represent larger org structures and so more people and bigger deployments, and more money.

> comp info seems a bit skewed for some companies and more senior roles

what do you mean, skewed?