The Canon eye cups are not lumpy on the 8x20 IS, 10x20 IS, 10x30 IS II and 12x36 IS III. They are actually quite comfortable, as rdnzl says above. I find the Canon 10x42 IS-L, 10,32 IS, 12x32 IS and 14x32 IS eye cups uncomfortable.I don't think Canon can 'fix' the eye cups, if they are like those on the 10x42ISL.
Henry Link posted a cutaway of the 10x42 some years back iirc, showing that the eye pieces were totally stuffed with glass.
Short of redoing the entire optics, Canon is stuck with lumpy eye pieces.