Some of these changes are reasonable, but I think the majority should be reverted, because the result is incoherent and unrecognizable. It looks good on a map but doesn’t reflect reality very well. Your expectation of secondary roads in this area may be based on traffic or development patterns found elsewhere but not here.

Most of the tertiary roads you reclassified are no more important for access than the other tertiary roads you didn’t reclassify, like East Kemper, Snider, and Pfeiffer. If you reclassify those roads too, there are few if any tertiary roads left. Meanwhile there’s no distinction left between these roads and others like Reed Hartman, Fields Ertel, and Tylersville that are more important for getting across this part of town.

In southwestern Ohio, the level of government that maintains a particular road is a good predictor of the road’s service area and importance to the transportation network. Our starting point has been that state, county, and township/municipal roads should occupy distinct classifications. You can therefore make out some patterns, like the section line roads in Butler County and the destination-named roads in Clermont County.

There are occasional exceptions. For promoting or demoting these individual roads, I suggest consulting an AADT map as a gut check. Otherwise, I think you should adjust your expectations to allow for more variability from metro area to metro area.