Thank you Nereid that is a good point and it is 'work still in progress'.
SCC in the first instance does not make "the spiral rotation curves problem 'go away'" and is in the same position with them as the standard model. The difference being SCC identifies any DM required as baryonic. (The problem for SCC is to explain why it is not observed, which is why the Giant Galactic Blobs may be significant)
However, as an educated guess, this role of 'baryonic DM' may only hold for the cosmological DM, in order to make the matter density parameter up to 0.22 from 0.04, but not for individual galaxy rotation profiles.
The reason being that a static spherically symmetric solution of the SCC field equations has yet to be found for an extended density such as a galaxy rather than a condensed central mass such as a star. Even in that case the SCC gravitational acceleration in the Jordan frame is modified Newton:
d2r/dt2 = -[1 - GM/(rc2) + ...]GM/r 2
but this does not give the MOND acceleration equation.
One intriguing thing about MOND is that although it does not explain cluster dynamics i.e. 'cluster DM', or 'cosmological DM' yet it may be connected with dynamics on a cosmological scale. The MOND anomalous acceleration a0 = 10-8cm.sec-2 is roughly equal to the Hubble acceleration cH, which is the clock drift in SCC between 'atomic' and 'gravitational' (ephemeris) time.