Hi Noar,
yes, your assumptions about my method are all correct. The parent program works as the aqusition program; the thing is we often use same ad channels for several campaigns, so if we used utm source based programs as aqusiotion programs, it would end up very misleading.
Parent-child program method we use allows to see a total number of leads acquired by that particular form and I can also track performance of each ad channel by the number of leads in each child program.
As for utm_campaign name - I get this from our GA guys, they also track channels performance in GA using utm links and have their own flow, usually campaign name would include the name of the product and time when it runs, roughly for a product "XYZ" we are promoting in Q4 the campaign name would be - XYZQ42014