The only reasons I've been able to come up with for why the footing is normally split is that many people add the footing to an already rounded shaft and to keep the overall weight down.
I don't quite understand the statement above. I make footed arrows using the footings from 3 riverarchery, a jig and an already round shaft (5/16 port orford cedar) I use footings beacause they are beautiful but also to improve FOC, it sounds silly to me that when an footing is added to a round shaft this is done to keep the weight down..Hardwood is heavier than cedar, pine or spruce either way it will improve FOC,..
I rarely have an footing split, If it does i haven't made the glue surface of the shaft thin enough or the cut in the footing is to irregular, I always use sandpaper to make the cut in the footing smooth...
I'm interest how your reverse footings will be holding up, would be too bad when the shafts aren't durable with the time invested in them, Post some pics when you have one finished.
greetings
stefan