It looks like once you find 10-12 blocks in solo mining, the periodic hash rate starts to even out. Its hard with Minotaur because blocks dont come that often, unlike pool mining where shares are 3-4 per minute.
Blocks don't come too often solo mining any coin. The 5 minute report doesn't really make sense solo mining.
I'm thinking about changing it, maybe 1 hour solo, and 5 min pool. 1 Hour is still too short to be meaningful
but it reduces the number of useless reports in the logs.