Looking at your audiogram I see possible room for word understanding improvement, maybe.
You have the KS10 aids now, correct?
Do you know if the frequency lowering technology is being used in those aids? The reason I ask is your lower frequency hearing is pretty good. It’s your upper frequencies that are suffering.
I would suggest going back to Costco and asking to try frequency lowering if not already.
This technology will sound strange at first but it dramatically helped me in the past.
Ask the fitter to adjust the frequency lowering settings aggressively until the S sound starts slurring, then back it off a little. Do each ear individually for best results.
Good luck