Thanks for the list! I prefer long-form comics as well, so I'll be taking a look at them. I also have a couple of suggestions of my own.
The creator hasn't moved all of the current pages over from Inkblazers yet, but it's long form and I really like 9lives.
No End is really good as well.
And if it's okay to plug my own comic, please feel free to take a look at Lemongrass.