Remove Lollipop status bar tint over color?
If you can use Xposed Framework (needs root), try any of the following Xposed apps which can theme your status bar:


Flat Style Colored Bars 
Tinted Status Bars 
Material Status Bar  


They do it by taking a sample from the app's action-bar and colors the status-bar accordingly as per some mode settings, which include Gradient, Flat (which you want and the unpaid default), L and custom. 

(Note: some features require an in-app purchase.)