38 mm tall (height of the rim in side view) Carbon Fiber Wheels

Installed the Shimano Ultegra 10 speed Cassette I already had, Bought new Quick Release Skewers.  Went for a ride and the skewers started loosening while riding.  Had to stop and strongly cinch them down (with more force than with "normal" skewers).  Replaced the rear skewer with a DT-Swiss brand & will replace the front one at some point also...
Is the bike any faster?  Can't tell...