Did tried the hubs with the wheel in my hands and it is smooth. I cannot do the same with the rear for which at least there is no lateral play. Today, just before going out for my Sunday ride, a fellow cyclist tightened the skewers even more. 100Km and the feel was quite different. The bike felt sturdier and that feel or murmuring was quite a lot less! I must put a bit more soul in opening the skewers, but it did wonders.