As a person who knows first hand about hearing loss, the very best is to wear the solid plugs, muffs or both. There's virtually no way, "0", notta, ain't gonna happen, period, that one's hearing does anything but get worse and never returns.
The Walker's Game Ear will shut off, but not quick enough in reality, however it certainly is better than nothing and does help, as you've identified. Its also a sound amplifier. Amplifiers are just amplifying the sounds louder, which means all frequencies are boosted louder. Even the frequencies that are not necessary to be boosted.

Hearing aids are expensive, but the frequencies are adjusted evenly. Ahhh the digital age. When I first started shooting, my dad ALWAYS required me to wear hearing protection and back then, very few wore any kind of protection. When he had me traveling some shooting competitive trap, that's when I noticed more shooters wearing hearing protection. So in a sense, I grew up knowing hearing protection while shooting was a requirement.

BUT..... that was my problem, shooting and not regular "noise". Then when I started in the factory, nobody wore hearing protection, so neither did I. BAD MISTAKE! Started running large presses that were 30' high and went 30' into the basement. After a couple years of that racket and the Arab oil embargo hit, I was eliminated from the press plant (preferred job) to final assembly. Of course being low on seniority, I started in the "pit". Yup, 3' wide underneath 120 autos an hour, tightening bumpers and transmission mounts, with a 25# air tool screaming at me in that hole! Never realized what it was doing until it was way to late. Now its 24/7/365 ringing and in my left ear I have tones (frequencies) that I'm completely deaf with.

As someone who knows all to well about hearing loss, I'm glad you found something that is working and helping. I'd caution though, if your hearing loss is pretty bad now, protect what you have left no matter what or how. Even if it means getting used to shooting with muffs, the trade off only benefits you.

I just picked up another new set of hearing aids. This is I believe my 5th pair. Even with my first couple pair, I couldn't hear a common cricket if I was setting over it in a chair. Then with the advancement in digital, I started hearing crickets again. Heck, it'd been over 20 years since I heard a cricket. This newest pair are Siemens MI 7, newest tech from Siemens. No matter what the tech, I'll never hear those specific frequencies I've lost.

See an Audiologist and watch (hear) your quality of life improve.