By thinking thru, I would watch for "wiggles" etc early on. That would tend to show suitability of arrow system with the bow. This is of concern because no matter how well they fly "eventually", your shot at a critter is likely to be much closer and the arrow needs to be flying clean at THAT point for best penetration.
At longer ranges I would expect all but really bad flight to be worked out and stabilized, but where they are hitting in reference to where you are aiming comes into play. Some arrow / broadhead combos just give you fits and they don't fly straight.
My uneducated thoughts are that matching broadhead to field point, in terms of grouping is not nearly as important if you are shooting only broadheads as the season nears, but very important if you simply switch to broadheads the day prior to season.
ChuckC