I will admit I was skeptical about your filters and whether they could make that much difference. But, life is short so I thought I would try them. I have an expensive 150mm filter system from another company that I honestly quit using because of the hassle.
I bought the Randall J Hodges kit of Galen Rowell hard GND’s. Holy crap! I am impressed. This system is so easy to use. These are some of the best photos I’ve ever taken. And all in camera. In love with the results.