at least for the A320 airbus differentiates between "basic forward C.G." (25%CG in take off, approach and landing configuration) and "alternate forward C.G" (forward CG limit) in their stalling speed tables (Vs1g) found in the FCOM. moreover if you consult the A320 QRH for in-flight-landing performance a note tells you:
For CG <25% add 2kts to VLS CONF FULL and VLS CONF 3
which corresponds pretty much to the average difference you'll read out form the Vs1g-tables mentioned above.
Do Vref and landing distance increase with forward c.g.?
so VREF increases with a forward CG since VREF=1.23*Vs1g for the bus.
Perhaps the manoeuvre margins to alpha-floor and alpha-prot are a bit marginal at Vref and forward cg?
in my eyes there is still plenty of margin to alpha-floor, etc even if you don't account for a forward CG, since a forward cg alters the VS not significantly.
interesting: there is no such differentiation for the 319 and 321.
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