I notice that the % dps increase from Zone and dps achievement is only added to the % dps increase from Idol. The same thing happens to % gold increase from achievement.

The DPS reward from achievement should be another multiplier, because when you have 500+ idols, 4% dps increase from Zone Achievement is not very rewarding if it is only added to the existing percentage.

Reaching high zone is not very rewarding already, please fix this so player can have some motivation to do high zone.