estepo,
There was a thread recently on the Private forum about
Collision Avoidance. Although it concentrates on 'mini-TCAS' systems (which are recommended), it also has a few other suggestions (alongside 'keeping a good lookout' and use mode C/S.)
One of them is to fit high intensity strobe lights (ie more than just the standard red anti-col.) They might not improve
your lookout but they might well help someone who's looking out for you.
Edited to add: Am I right in thinking that you own and fly a Gazelle, estepo? Another trick is to paint one of the blades in a contrast colour to the other blades (with approved paint on all 3 blades, obviously!) This makes for a very visually distinctive rotor disc from above.
PS I'm guessing that you're already aware that under an FIS, the controller is actually under no obligation to pass you traffic information.
The fact that we in the UK often receive a sort of RIS service whilst under FIS is convenient for us, but often frustrating for some of the controllers.
HTH