I stack ND and ksm or the UV + ksm [the UV+ ksm when lazy or in a hurry .
It sounds funny but sometimes I get light vignetting - sometimes not . I just figured it was focusing at different distances ,
But it could be different ksm's or UV's [probably 60% of the time that I use a CPL - I use a rubber hood - easier to adjust cpl - just turn hood .] . I carry 2 ksm's , uv's and nd's with me . They are all B+W and are bought at different times so not matched or from same batch .
Oh , on my 10-22 at 10mm , never had a problem with the 17-55mm . I have 2 slims - don't like -
If you go for the slim , put a rubber band on it - a lot easier to adjust and gives a little extra space before you touch the glass on cpl .
BTW - I carry the little packets with a piece of tissue with alcohol on it . Open and wipe tips of fingers - it removes finger oil