Fuel level

I’ve got an issue with fuel gauge going on about 4 months, won’t go past 1/2 tank on gauge when filled up, I’ve already replaced the passenger sender, cleaned driver, run 4-6 tanks Techron with Chevron gas through it, had gauge on engineer test mode, went to e then f then back to half but works fine on tests, when had senders out I ohmed them and got 10.4-5 on full on both, 180-182 on empty on both, can one still be bad or just need to put two new ones in and see how that goes, read that they work together to sum up fuel amount, not one does each side, but did notice I’m pulling from passenger side first after fill up, then driver side, so ones all the way down, ones all the way up but gauge works from 1/2 to E ! So any ideas? It’s a 2014 GT, Thanks for any help.