I still dont get this. SHBG has nothing to do with how rapidly one absorbs or eliminates free testosterone. Myth. Is it associated sometimes with rapid clearance? Sure. Correlation vs causation. You could try pinning once a week and test free testosterone using equilibrium diaylsis to prove this for yourself.
SHBG sets your TT based on your fT level (which is a function of clearance and distribution volume, neither of these depend on SHBG).
Low SHBG guys look at their TT and think there is something amiss. There is nothing amiss with their fT once they take exogenous T. Their TT appears low (relative to a higher SHBG guy normalized by dose) because their SHBG is low.