Sadly, all this leads me to believe that my 20 minute power is no where close to 300 watts. 
I’m still way stronger than I was last year.
Last night I did a race simulation club ride and made a new best power on every point on the PMC in WKO5. 
At least I know now that my Powertap and my Stages are very close and my Tacx Vortex is way off.