Have you read this:
https://www.reddit.com/r/TheSilphRoad/comments/5y9if1/osm_and_pokémon_spawn_correlations/
> I found most of my edits only had an effect on the game after two nest migrations, roughly.
> Disclaimer though: edits will only affect where and what spawns, not the number of spawns. That's defined by cell phone usage data. If there are no spawns in a given area, after the area is tagged in OSM there will continue to be no spawns there, regardless of what is tagged, since there's nothing to shuffle about the new data.