It is a point of nonsense based on a misunderstanding, as far as I can tell. Mass does go from 0 to infinity - there are particles in nature with exactly 0 mass, particles with very, very small masses, and particles with fairly high (by particle physics standards) masses.
As for your "time runs at an infinite rate in perfect vacuum", you have apparently already repudiated that, since you seem to agree that it runs at a finite rate both inside and outside of a thin shell of mass.
So I have no idea what you are talking about, basically.
It is over 9000 A.U. to the nearest space with that weak of a gravitational field.
What I do agree on, is that whatever you call it, a field or a potential, it does not cancel. There is not any method of canceling out a gravitational (field) to test this, in nearby space.
Since a fixed framework of space can have a faster time flow, light and other objects with mass and velocity pretty much appear to act the same as they always do. That is unless you actually try to measure the speed of an object, by either a very large baseline, or by estimating its speed from its surroundings. Redshift is only accurate if you know the time flow of the object emitting or reflecting the light.
Other than a few phenomena like massive stars moving through space faster than they should, and the universe not listening to what humans think about how the universe should work.
My best guess, at present, is equal to gT2=G/2 or 3.337e-11m/s² which would equal a time flow of 2, The constant G as a gravitational field, could also represent the absolute 1 (one) time baseline (without motion or gravity) for the flow of time. This is only a guess.
This is the same G as the gravitational constant. This factor linearizes the mks system so that the math works out correctly for masses measured with the mks system. The mks system also incorporates time, how weird.
This factor might also represent several solutions to Time Space metrics. It could represent 1, 2, or the SQRT(2) or divide G by 2. But it is in the basic formula for calculating the strength of gravity for a reason, and this number may not be a coincidence when applied to other problems.
NGC 6946 appears to follow my calculations. The problem is that my numbers are higher than theirs past 15 kpc. They may have imaged a part of the spiral as it was collapsing inward toward the observer. The equations are very sensitive to minor fluctuations from the core, like a bar section of a galaxy rotating.
As the end of the bar approaches, the spiral arms are pulled in, as the arms pass, the spiral arms move back out. Past 3.337e-11ms gravitational fields get non-linear quick.
No windup problem that I can see, just something else that the humans missed.