When I "de-glossed" my GW-Hills I had to find out, that matte-sprays dont work well on gloss unless you at least double the distance stated on the can. You can greatly influence the effect by distance, even up to intentional "frosting". Therefore I wonder if all the products you tested claim to work best at the same distance. Maybe some work well with the distance you usually use, and others don't. If you still have the cans, could you please look up this small detail?