If you like the Wave, you should try out a Waved Endura. It's much easier to open than the Waved Delica. I think it's from the extra leverage/weight of the longer blade.
I've tried the Waved Endura and didn't like it because the handles were way to long for me, but I think you're right with it being easier to open, although I have no trouble at all with my Delica.
