Im sorry to say it but playing a Maran now seems to me like it would give you more of a challenge. Really, based off your explanation, those who play evil for MOAR PK action really are not looking for MOAR PK, they are looking for MOAR EASY PK.
Yeah Marans probably shouldn't strike in town, how many Chaotic Good (including Garonav) Said "Fuck that, if he is red I'm attacking". Its an added risk that makes your game a little more challenging.
As a Maran not only do you get the chance to strike at Scarab, Orcs, Goblins, Outlanders(Reavers), Tribunal(Evil is the thing it seems lately), Empire, Probably Entropy, but any person with a red aura, and as an added bonus you get to RP with the less skilled players to try and teach them to be better as well. (not me, I am a waste of breath when it comes to learning. LOL)
To me your arguement just sounds like "I want the highest PK numbers so I will choose the easiest combination so I can kill all the newbs!" Then you get 10 or so actively doing this so it becomes a one sided murderfest of anyone who actually will bring some diversity to the game because all of the "competitive" PKers are all sitting around a biscuit jerking off to see who gets to go murder the one person that is not in the circle. There is no challenge to your thought process and frankly makes you less competitive than if the veteran PKers would be split between all aligns.