Layer doesn't finish on ironing

Hello.
I am printing a relatively small print, 100x20x40mm in PA12 at 100°C/260°C
I have a layer in the middle of the print where most but the outskirts gets ironed. The printer prints most of the layer, then irons it out, then finishes printing a last part, that at this time in the printing process sits on the other side of some supports to the main bulk.
This last part does not get enough material extruded and becomes very weak.
Is there a way to make the printer change how it prints a layer, so maybe start from the outer side or is there a way to access the g-code for a specific layer and alter it?
Thanks in advance