In terms of physics:
dive acceleration = earth gravitational constant + excess thrust / mass
It is easy to see that as long as excess thrust is larger than zero, mass will reduce the planes acceleration. Excess thrust will be less than zero when the plane is above level speed for that power setting. Also, in typical flying conditions, earth gravitational constant >> excess thrust / mass, so excess thrust / mass doesn't really matter.
If you don't care about physics, at least search for the TAIC test FC99 mentioned, read it, and adjust your expectations. That time would be a lot better spend than making another dozen posts on the issue here.
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