That's for the studies about declaw, I am just not a believer in that.
I have owned cats all my life and they have all been declawed and I have never had a problem. Same goes for my aunt, but I do thank you for trying to help.
How can you not believe it? It's sort of like saying you don't believe in science or something, the results speak for themselves. Owning several cats that are declawed is not a large enough percentage of declawed cats, just because you have been lucky does not mean that serious consequences do not exist. You may be facing them right now, whether you choose to believe it or not.
The practice is banned in most forward thinking countries for its barbaric nature; in fact, just about anywhere but North America. Britian and most other European countries, Australia, New Zealand, France, Germany, Scotland, Japan, etc.
Any other ideas or what it could be or what I can try?
Outside of locking your cat 24/7 in one room, or a cage, without carpeting, and forcing him to use a litter box? Probably there aren't any other options. Know when he's more likely to use it, praise him when you catch him using it, give him treats, and let him out under supervision for a short time. Eventually he may become trained that the litter box is where to go.
Maybe try ripped rags if he is so partial to carpet, and either tear out your current rugs or entirely soak them in enzyme cleaner.
I know what it's like, cat pee destroys not only the carpet, but if you don't have a good inlay (luckily we did) it will soak into the concrete below as well, and it will soak into the walls as well, causing parts of the walls to need to be replaced, and it will warp doors, and wreck clothing, and only smell worse the longer it goes on for and will permeate into everything... we have a cat that's done it for 17 years
Now that we keep him in one room, and are repairing the damages he did to the old place (extensive and costly), he only pees against one small wall in that room, which we line with newspaper. If left to wander the house he'll spray, and when he's outdoors he sprays as well. Looking back, as much as we love him, it really destroyed the better part of 15 years (the last 2 he hasn't had free roam) as far as socializing goes, or even as far as enjoying living in our own house goes. You know where's something wrong when you think "I'd rather not go back home" ... and need to shut bedrooms doors to prevent your cat from wrecking a single decent room of your house. Looking back on the years now, I know I'd never do it again; there's other cats out there that need homes and can be just as sweet and loving. As heartbreaking as it would have been to surrender him, I don't think anyone should live like that. I feel bad for your husband if he's not an animal person, he must really love you to put up with this.