There should never be any need to speed intervene unless GS-mini is getting towards the flap overspeed limit (even then, briefly pull speed and go back to managed speed as the wind starts to drop off as you get closer to the ground). Providing your IFLD permits it, these gusty sorts of days are great for flap 3. It gives you a few extra knots on the flap limiting speed, helps the aircraft settle onto the runway and gives you more performance in the go around
Agreed with the first statement. There's no need to even momentarily go select because the GS mini limitation on IAS with full flap is VFE-5 and as the speed trend goes to VFE ATHR will head towards idle. Even select speed can't do more GSmini IAS limits are VFE-5 in full and VFENext for other configurations. So in Flap3 the IAS limit is 177kts. i.e. 8kts less than VFE of 185kts.
and in Flaps full it is 5kts from VFE. but aircaft will find it easier to accelerate in Flap3 than Flap full. So not much advantage. Besides in turbulence for better handling Air bus recommends Flaps Full not Flap3 unless windsheer is expected.