I've noticed the valves on my Courtois Euph are A LOT heavier than Bessons. I've tried a bunch of different springs and they always feel a bit odd. Either the springs are a bit too stiff so hard work to play quick passages, OR the springs are too soft and the valve action is poor. Because of the weight of the valves they have a tendency to want to 'bounce' rather than move in a single up and down motion. Is it just me (Glyn Williams does pretty well with his!)? What do (or would) you do? Why would Courtois make their valves about twice the weight (a guess) as the Besson equivalent?