Mine are the exact same way. Even before installed I had a hard time moving them if they weren't opened or closed for a while.

As far as getting better with time, I am unsure of that. I've had mine installed for a year now and still find myself cursing at them sometimes

I then remember the alternative, having water pouring out all over the yard, or having to find the plug for the skimmer that never seemed to stay in the same spot.