What I have found, is that if the spine of the arrow isn't correct for the bow set up you are shooting, you are going to have a heck of time getting fixed blade heads to fly right with the field points. I also think this is why some people choose to go to mechanicals instead of fixed blades. Not that there is anything wrong with mechanicals - I just don't care for them.
My own experience is that if you get the spine of the arrow right - fixed blades will fly right on with field points. This also goes along with the archer doing his job in maintaining form. In my trial and error testing over the last 5 or 6 years, I've successfully gotten QAD Exodus, Slick Trick standard and Magnum, Thunderheads all to fly spot on with my field points. I have a new broadhead I'm trying this year - Magnus Black Hornets - I haven't shot them yet but that is next to do.
With my bows, I am able to get fixed blades within an inch of a field point at 60 yards shooting around 310fps. This was with my previous arrow set up and with my new ones I'm still doing minor tweaks on pins (I think I'm done with that now) but my fixed blades were hitting on with my field points at 50 and 60 yards.