Are your forms modal popups or integrated on the pages? Or does say the home page link to a separate form page?
If the forms are loaded on various pages, on your form submissions are you collecting any dimension data (like the page, which form was submitted, etc)
Basically, rather than trying to come up with fancy sequential segments, just including some basic correlation can be very powerful.
For instance, I track "search submitted" on our site (basically this is a simple form).
Now, on most pages I have two search forms (the "desktop" version, and the mobile version". On the Search results, both of those exist, but then I also have a page specific "refine search". So I have a dimension that tracks the form (was it the desktop, mobile or refine search that was submitted), I also track the "page" and "url" in their own hit expiry eVars (I use eVar because of the 255 character limit, but hit cause I don't need this to be attributed from previous values - in fact, the page and url eVars are captured on all PVs and actions).
To help provide more specifics, it would be helpful if I could see the site... while you may not want to share this publicly, if you are willing, you could send a link to me in a private message.