I had a similar experience where after 6 months of trying to get set up with new Widex aids (after no previous issues with different dispenser who left) my hearing still wasn’t right and I just couldn’t understand what was going on. My new dispenser then left, I tried a new (correct) set up and suddenly everything was great.
The set up is key, every time you have a new ear tip the sensogram and feedback calibration needs to be re-run, the ear fitting type selected on the screen (ie slim tip/ric) and the vent selected. Also check it’s the Widex rationale. Any of these steps not being followed will mean your prescription isn’t being matched according to the fitting software calculation for your loss. With the excess high frequencies it may be that this was the sensogram fitting for the generic domes which would likely have given more high frequency. When changing to a custom tip this gives greater clarity so if the sensogram isn’t rerun and all the other steps, you have the previous higher frequency fitting along with getting more high frequency with the custom tip meaning it is no longer matching your prescription and giving too much in this area.
I would ask the fitter to confirm that the sensogram and feedback calibration have been done for your current ric and custom tip. Also check the hearing aid type on the screen matches what you have, and that the vent is exactly right (.5 out and it will affect the results, or marked as no vent if that’s the case). If you are still not getting the right results ask for the Widex rep to check the set up.