Hey Carla,
I don't have a specific answer regarding your BM (get it, bowel movement or believing mate?) hahahaha. Anyway, I digress.
I've seen a lot of slacking off in the FS in my area.
However, a witness with an unbelieving mate often times feels it necessary to put on a strong front. In fact they are encourage to do so by the congregation. Remember, they hear a lot about how you, the unbelieving mate, can be won without a word.
I'm in a somewhat different boat. My wife knows I know the truth and have rejected it. She doesn't try to win me without a word because I've rejected the truth. But, your husband regardless of what you've said regarding the truth is still intent on showing you how great it is. - probably (imho)
Does your husband complain about the congregation? any of the friends at the hall? Do you get invited to get togethers? Does he leave literature around for you to accidentally find? Does he smile and talk about how great he feels or how happy he is - in relation to the truth? These would all be things a believing mate would do in order to win you over without a word.
So, where others may see a lessening of FS by mates or witness friends you may not see that same trend in your household.