  We have proposed that galaxy formation is catalyzed by the collision of
infalling and outstreaming particles from leaky, horizonless astrophysical
black holes, most likely gravastars, and based on this gave a model for the
disk galaxy scale length. In this paper we modify our original scale length
formula by including an activation probability $P$ for a collision to lead to
nucleation of star formation. The revised formula extrapolates from early
universe JWST data to late time data to within a factor of five, and suggests
that galaxy dimensions should systematically get smaller as the observed
redshift z increases. We also show that particles recycling through gravastars
can lead to a reduction in the temperature of the surrounding gas, through a
``heat pump'' refrigeration effect. This can trigger galaxy formation through
enhanced star formation in the vicinity of the gravastar.
