tbf the Cannondale has done nigh on 10k miles, should expect some wear. Had the headset out after I did the BB, bearings perfect. As Hambini succinctly says, tolerances... Cannondale aren't renowned when it comes to a BB, onto it's 4th. That said it's lovely to ride, super light (Sram Red), stiff yet comfortable and rock solid at speed. I had an SS Evo hi mod in a 56, my 'correct' size but always felt I was sat on it rather than in it. When a 'Black' nano carbon version came up nos at a local shop in a 54 I grabbed it. The Evo was a solid performer, with same components it rolled along as per any bike but when you hit a hill or just needed to stomp on the pedals it took off and you felt more connected. The 'Black' has a liveliness the Evo missed with all it's benefits. What a bike. I've a TCR I use through winter, it's far more nervous at high speed and feels sluggish by comparison to the Cannondale but at a 1/3 the price it should!
Shame about Beone, didn't know they were Dutch. They had a distributor in the UK and quite a few local shops kept them.