Nothing will boost the Mavic Pro done output power unless you add an additional amplifier at the Mavic (assuming you leave the MP antennas unchanged). The only way to get a better return signal is using a more directional antenna and/or receive amplification. Its basic physics
Well, that would be true, except if you read the detail of the FCC hack, it states that the controller updates Mavic side radio settings as well. The controller tells mavic to change radio settings based on DJI config file in DJI Go app. I'm not saying I've verified, just what it says on the site. Obviously boosting with an amp on Mavic side would be the best result as BubbaBean is already doing with a 4w booster stripped down to 10 grams.