RE: arrow placement on target
I'd say that was a tuning issue for sure. Nothing should be that far off and the bh is telling you something is wrong, they don't lie or mask the truth like a FP would. Just an fyi, Imo blazers are more prone to fly left or right with bh's in a cross wind than a 4" vane. I've shot both side by side and can find no advantage to the blazers over a 4" duravane even though they weigh less. They maybe more durable as my duravanes got pretty tore up last season due to some briars (the reason I'm looking for a replacment). Shot placement is the same out to 70 yrds. but the duravane is more stable in a cross wind, not much, but some. I wouldn't trust either to tell the truth. Your arrow weight and foc have changed with the BH, which changes the spine some. How close you were to begin with I can't say. Haven't found or herd of a BH that weighed what was claimed. Mine are 6 grns. heavier.
I'd tune it with a BH and let the FP's fall where they may. There not picky. Just my O.