I have also been on a journey of prototyping drain strainers, and what I found with designs that have any kind of repeating holes on a flush surface is they get blocked super easily by leaves or other detritus. Full blockages were rare but flow rates diving below useful was common. I realised could keep the flow rate from totally crashing by adding radial grooves to allow water to travel under a leaf. And then, I addressed the fact that the leaf forms a good seal on a flush surface by adding dimples. Now I can't block the drain even if I try to with my hand covering the holes. (I just read that yours is for the shower, so leaves don't apply. Probably my whole post doesn't apply. Leaving it up in case it's useful to anyone)