Today the weather was better and i flew again.
For comparism (all with RC305 and 200mw 5.8GHz):
With linear polarized antennas
my max range: 2.8km with a 11dbi BiLoop and 1.9km with a 8dbi patch
max altitude: 550m
With CP antennas
With the CL+SPW i did 1.7km on bad weather.
Todays results with CL+SPW
altitude: 740m (with very good picture)
And of course the CP antennas got way better signal on low passes or behind trees plus they are not directional, so i can fly in any direction.
I really will not go back to linear polarized antennas