Problems with a new cube

I recently got myself the new Gan 15, because people where saying it was good and I wanted a new good cube. Before I had a Gan 356 Xs (pretty old cube) and I thought getting a way newer cube would make my times way better. But now my times actually got a bit slower (16.10 to 16.5 Avg. of 100). Is it normal neesing some time getting used to a new cube like this or why are my times worse than with the old cube?

I think they are worse because I often lock up with the Gan 15, I already tried finding the best setting for not locking up.