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Alex,
I confess to not having read all the posts in this thread so pardon me if I am repeating what might have gone before.
It seems to me that the size/mass of a black hole is not all that significant in the overall gravity relationships throughout a galaxy, as you seem to suppose.
It seems to me that a black hole will strongly influence nearby space, which will inturn influence all nearby space. That not well expressed! Notice that galaxies are not hollow centered, but rather tightly packed toward the core thining out until gradually the 'disc breaks apart leaving spiral arms. It is reasonable that the gravitational density within a galaxy is highest at the core, and gradually deminishes at it radiates outward. But consider; the black hole might only effect perhapd the first 45% or so of the solid galactic disk, the outer extremities of that, effecting the more outer areas with ever diminishing effect untill finally the net gravitation of the galaxy is no longer able to influence anything. If this is so, then the upper limit (theoretical) need not dictate the ultimate mass limit of a galaxy as it will be somewhat self supporting in itself.....me thinks
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