Google map multiple overlay no cumulative opacity

Question

I\'ve got a map with multiple circles crossing each other (bellow is an example with only two but it\'s about 100 circles at least). When they cross, opacity is doubled, so

Answer 1

I have a similar problem, but my overlays are irrigular shape rusters. The ellips in the following example are just to demonstrate the issue but the actual rasters are shapes of any form but having all the same colour: