I'm an owner of a Leopold FC750R with MX Blues. Haven't tried Clears, nor the WASD Code, so I can't comment definitively, unfortunately.
I will say, though, that the MX Blues are my favorite switch of any that I've tried (Topre, MX Brown, MX Nature White), and the Leopold FC750R is my favorite board of all that I have (Topre Realforce, Filco, and Ducky Shine 5). Again, I haven't tried the MX Clears, but I just love the unambiguous, crisp, and clean tactility of the MX Blues - I just got annoyed with the MX Brown after a while with its pseudo-tactility. The tactility of the MX Blues I think helps a lot with typing.
I also game with the MX Blues (but I'm not a pro-gamer or anything like that), and I think they're fine. But, everyone's experiences may vary.
The sound of the MX Blues is not a problem at all on the Leopold FC750R - the sound dampening on the board might have something to do with it. I think the MX Blues sound amazing on this board, in fact.
I felt that the actuation force of the MX Nature White was too much for me, so do have actuation force in mind when choosing a switch.