Landing Pages Tracking Optimization- Help!

Hi!

I would love to hear some ideas about how to optimize this:

I have several campaigns in different channels, we have to set a different Campaign code in each type of campaign according to the channel so we are able to track exactly the source (Analytics sometimes gives us duplicate leads so it is not accurate data), for this we need to duplicate all the time our landing pages, and campaigns in order to change the campaign code in the flow, however I would like to have some reccommendations if there is any way in marketo to set different camapign codes depending on the source without having to duplicate all the time the landings.

Any ideas?

Thanks a lot, looking forward to hear your replies!