The parameters what you have entered to PERF APP page, except minima, does not effect ILS approach itself. If MCDU landing airport elev is 1000 and , if you re now landing SL, of course you cannot enter MDA as 200, it will not be allowed. But vice versa no problem again.
Once you activate the approach, you do not need the make any weight calculation adjustments on MCDU because then FM comp will consider real time weight for Vls calculation. For PFD Vls, even no need to activate the approach because FE comp always calculate and display real time Vls (regardless of anything).
Even if you enter correct wind for now, to Perf page, GS mini function may not be working properly if direction of landing runway now and planned runway is quite different AND if the entered wind is strong enough so that 1/3 of HW component (as compared to landing runway now) > than 5 K.
For some hints, I recommend you to refer FCOM PRO-ABN Immediate VMC landing Diagram, you can find some details as I have tried above
If you rush everything and forgot a lot (including PERF P and activating App etc), fly final approach at a speed around Vls +5 at PFD ( with selected speed ) for Landing Conf.
Regards