Auggy, I’m really not sure what you’re trying to say. If you do a trial of some aids, after you’ve worn them several weeks most fitters will do a “real ear” test to see how they’re working. The real ear test is not exactly the same as the audiogram done without aids. The hearing aid fitters who visit here can probably explain it; I can’t. Anyway, I think that’s where they can fine-tune the “equalizer” function of the hearing aids.
I have a flat loss in both ears which is similar in severity to yours. In my real ear test, I’m hearing in the normal range in all of the speech frequencies up to 3000 Hz and I have a mild loss at 4000 and 8000 Hz. I’m not using a power aid or audibility extension. My hearing aids are not top-of-the line. I’m very pleased with them. I would suggest that you do a trial of the aids from Costco, if they seemed good during the demo, and see how you do. If they don’t meet your needs Costco gives you lots of time to return them and get your money back.