What did you use for the roux? Did you do it from scratch or use a premade foundation? (Zatarain's, perhaps?) To be absolutly honest, I have had it gravy-like and thin. There is a place up in Denton that is owned by folk who come from the Source, their roux tends to lean towards the thick side. ( But not as heavy as most gravys.)
If you do not wish to go through the time that is takes to build a proper roux, boiling fish down and using file' , I might suggest looking into using Tony Chachere's version. You can rarely go wrong with the products he offers.
Not spicy enough? Meaning "heat" or flavor?
Jimmy Buffett said that Gumbo is ..."a little like religion and a lot like sex." If its' done right, truer words could never be spoken.
Now! Back to our Weather Reports!