usually those are good conditions, but if you see that a colony swarms few years in a row, and you are certain they still have enough room to expand, well that must be genes, but on the other hand genes...
queen A is very swarmy, B C D E are other queens, we know that drones are actually queens replica, s far as genes go so
A colony swarms this year, the queen left in the colony is now only HALF A queen, so the third year and the third queen is only one quarter of A queen... basicly, it's more a coincidence that the same hive swarms..i don't know 3-4 years in a row, because after 4 years,almost all genes of the so called swarmy queen are disappated.
at least i see it so, maybe i'm wrong
as for supercedure, i think it's a good way to make an extra queen, at least i hope it is, i'll try to remove the old queen and use her for a new colony, because in my criteria she is still more than good, especially compared to one of my poor queens.