Sorry Bengerman....had just deleted my post before you posted as I am not sure what different mods of FMGC will do.
On my aircraft selecting TOGA is not a great idea and will climb in SRS......I have seen it a fair few times mostly sat on the jumpseat. It is a hamfisted way of flying the go-around just to sequence the fltplan.
The discontinued approach procedure is simple and gives you thinking time. I believe it was introduced after a few aircraft at LHR went around above missed approach altitude and ended up at 6000ft!!