There is no reason why Clears on Leopolds would be different than on other keyboards.
And yes, Clears are little scratchy when they are new.
If you would build your own keyboard, then you could either lubricate them or try to get Zealios V1 instead which are much smoother. The Zealio V1 is discontinued now though, but there are still some left at some vendors.
Outemu purple are also similar to lighter Zealios.
