Not sure what your idea of aesthetically unpleasing clearance is but 10-12mm is pretty standard for bikes that are ridden. The idea is not only to block water but also to channel away any objects that your tire picks up - which is the reason why the gap at ingress should be slightly smaller than the one at egress.
Not sure what your idea of aesthetically unpleasing clearance is but 10-12mm is pretty standard for bikes that are ridden. The idea is not only to block water but also to channel away any objects that your tire picks up - which is the reason why the gap at ingress should be slightly smaller than the one at egress.