I'm really glad to hear that Tapas is flexible in taking care of its Premium Creators! But it also sounds like some of what you've described doesn't apply to the Incubator.
This specifically does not seem to jive with what is described in the Incubator FAQ.
"As this is a co-production agreement, the copyright of the work will be shared evenly between the creators and Tapas Media, 50/50. Tapas will fully fund the creators to develop the work, give access to editorial resources, and work on developing the project for opportunities such as print publishing, redistribution and TV/online series deals. Funding and resources will be provided by Tapas, and profits will be shared 50/50."
The Incubator does not suggest that you're able to negotiate this aspect. In fact it says "If the idea of joint ownership isn’t comfortable with you, please don’t feel obligated to apply."
The reason people are wary of this isn't so much that they're afraid Tapas will do something nefarious with their IP. They're worried that if something unexpected happens, like Tapas loses investors or suffers some kind of financial crisis and shuts down, then the IP they worked so hard on could become hostage to a company's bankruptcy proceedings. If Tapas went down, but wanted to save its IPs just in case they successfully optioned one for film (to rebuild capital), as a creator you would have very few options to fight for it back.
AKA what happened at Tokyopop. Afterward, some creators admitted that they did not feel like Tokyopop mislead or tricked them into giving up their 50%. But they still lost control of their work for years.
Long story short: even if Tapas has the best intentions, shit happens, so make sure you protect yourself and your rights to your own work.