Tale of the faulty fuel gauge!!!

Either sender should report 10 ohms at full and that should take the gauge needle to 'F'. The physical/mechanical difference in the aftermarket sender means the needle will stay at 'F' longer then drop like a hammer to somewhere between 1/4 and 1/2 tank. There is another thread here that shows this difference in float arm length/reach/travel. Anyway... There just might be a problem within your gauge too since you stated that the needle doesn't go all the way to full. Only way to know is check for the 10 ohms at full.
Could meter match module adjust that proven 10 ohms to 8 ohms thus pushing the needle higher? I have no clue. Good luck with it