Lasiorhinus is correct.
even on small aircraft the stall speed increases with a fwd cog, that is why FAR 23 requires the stall speed to established (amongst other things) at the forward limit at MTOW. other handling issues are required to be investigated at the forward regardless cog.
Net lift will equal weight, ie subtract the downward 'stabilising' force from the upward lift produced by the mainplane(s) and fuselage and the net will be the same as weight, the airacrft just thinks that it is heavier though mass remains unchanged. Also consider that the Vh is reduced at fwd cog due to the increased drag due to the added trim drag of the tailplane and that the increased total lift (up and down) produces added induced drag, ergo slower speed for same thrust. aft cog will reduce Vs0 and increase Vh in all aircraft, the larger the aircraft the more quantifiable this becomes.
HD