POI? Just make sure the gun is shooting where you're looking (adjust comb), then check the POI...i.e. how high is the gun set up for, 2,3,5 inches etc? Refrain from using the percentage convention, as the % changes with the choke constriction that you use.
I prefer a fairly flat shooting gun. My 1187s with the factory field stock patterned 50/50. After installing monte carlo stocks, they pattern 60/40. I realize that it is often desirable in trap to have high POI, but I have a hard time switching from a relatively flat to high POI. So my compromise was to install a monte carlo stock on all of my 1187s, including the field guns. Same POI. Makes it a lot easier, plus I can shoot my field guns for trap and sporting clays for practice.
Much like Brian, I have spent a lifetime shooting flat shooting field guns, my first "trap gun" was an 870TB which was 50/50 at best... I have slowly raised my POI on my BT with an adjustable comb to maybe 70/30... I just personally can not "float" a target (or more accurately am not willing to spend the time & targets to relearn it). I have spent a lifetime "putting the bead on the bird", admittedly they don't print my picture on the cover of Trap & Field magazine, but my misses are between my ears not an equipment issue.