Just to be clear Rae, yes, regardless of tyre brand, I have experienced a slight 'squirming' when travelling over painted thick reflective white lines (ie those that are noticeably thick and raised when riding over/across them) in the wet. Doubtless not helped by the fact that when contoured, these erfin lines/markings do present a real hazard! Heaven help when I encounter the suicidal 'armadillos' that councils are raving about to protect the other VRUs......cyclists!