Alternatively, let's set the global back to 1 and just individually buff. Then people can complain about drops being too low and we can increase the individual rates.
Mustercull already limits how many can spawn in a particular area. If there is improvement to be made in the blocking of spawns it should be done within mustercull since it is the plugin that is suppose to control mob populations.
I thought we found out the mob spawn range was too small as ttk speculated here http://www.reddit.com/r/Civcraft/comments/2yfn2t/morning_changelog_20150309/ Maybe try bumping the range again since I don't think lowering it really helped with lag anyhow.