I had Menier’s and know what you’ve gone through. I hope the attacks has lessened or ceased. With it my WR went from 80%+ to the teens. I share many of the same problem except for the car and my Subaru isn’t the quietest car.
As to brands, it really difficult. I’ve tried the Signia Pure version at Costco and settled on the Resound Linx (KS7) and didn’t find much brand difference with soft voices or get solid understanding with either. It helps but the Meniere’s did a number on me. From what I gathered, Meniere’s isn’t a specific disease but a collection of symptoms. Typical though is a loss in understanding/WR.
Share your love of horses. Had Quarter Horses and rode cutting horse in the past. If you ever get the chance to ride a cutting horse, give it a try – it’s a blast.