The issues you stated have been improved, although the speeds have not been changed. The first zombie now has 10000hp vs 7600ph, the zombies should regen health again. Not all zombies regen at the same rate or way. So lets see how it goes, with fast zombies regening faster but the same amount of hp over time other zombies like deformed lake a long time to regen but will now regen much more health. Example the amount of health that the deformed gets is almost 2x more than before after 20 seconds, but it takes him 20 seconds to get it. This is useful for strats as the deformed will need to wait a minimum of 20sec to be effective at another attack, otherwise his health will be the same. Such time gives humans a reload break.