Dava Control Grip Tip Delrin Picks

My first Dava picks. I like delrin picks and variable pick tip seems like great idea. But in reality I didn't connect with it. Sound that you get is bright and the grip is very good. Delrin is durable material so I excpect long life of those picks. Only thing that it's not ok is that control of tip thickness. It's not thick enough regardless of my grip. I like picks around 1.5mm. Low or high position of fingers doesn't create wanted thickness. I've tried it for couple of days so there is chance to change my perspective. I got to be fair and said that maybe it's my incorrect technic. So far, not impressed.