As a general nebula filter a UHC is probably the better buy, but for Planetary Nebula you can't go past the O111.
It is not unusual to get the colours you describe, depending on the type of nebula you observe.
Stick with your O111 filter as after a while you will get used to it and probably enjoy it.
The only downside of the O111 is it darkens the stars.
but it brings out more nebulosety in Planetarys
Both filters can be used in Moon light as a light pollution filter to some degree
