If anything, the KB really needs the wider gaps to safely live. Many posters here who have failures related to running too tight of a gap with the hyper pistons.
The KB pistons mentioned have the top ring up very high on the piston so it sees a lot of heat. The heat causes the top ring to expand and that is why KB recommends a larger gap on the top ring for those pistons.
That said, the folks mentioning that taper is of more importance than the slightly OS ring gap are on the right track.
The slight increase in ring gap observed by the original poster will not be enough to impact blow by or compression assuming that bore geometry and size are with in specifications.
