Sky Fortress Overpowered

[xenocide85]

I was thinking about it... what if the SF ult was modified to be more similar to the grav tanks? Being, what if it works exactly as it currently does BUT the tank being targetted can never drop down between 40-50% max HP while shut down. That way, the SF can do a lot of damage, imobilze the target, and prevent it from doing spells and weapon damage, but does not guarntee that the tank will be destroyed or entirely nullified.

your thoughts?