Hobbes, If your not confused by now you never will be! Actually what your seeing here is just what somebody else has already mentioned and that is the charts are just a good place to start. The arrow sizes you mentioned seem too stiff for your weight of bow but if you have them then try them.

As an arrow gets stiffer the archers paradox mentioned lessens. This means that for a right handed shooter the arrow bends around the bow less and when it straightens out it stays further right because it straightens quicker. A softer arrow bends around the bow, flexes right and then left again bringing it back to the line of sight (hopefully) If it's too soft the flex back to the left goes too far causing the softer arrow to hit left.

Now with all of this wonderful knowledge the only thing that matters is how your arrow flies from your bow with you shooting it and with a broadhead on it. I've been hammered on this site before for saying this but "I" still bare shaft tune all of my bows with my hunting heads on. this is done from 10 feet into a neutral backstop first to see where the nock is and once I'm hitting straight I back up to 5 then 10 and finally 20 yds. If your arrow flies with a broadhead bare shafted I guarantee all other points will fly great.