Change contrails visibility range?

Does anybody know what the default range is at which I can see contrails. Is there a way to change/increase it?I don't mean at what alt do they "come on", it's 30,000ft, that I know. Sometimes, when I do lower flights, say at FL290 or even FL250, I'd like to see the contrails of AI planes up higher. Heck, I'd love to be able to see'em from the ground. Any ideas?Thank you, Danke, MerciTorsten