I had the same results with them. The flight was not good when using a fixed blade broadhead. If I remember correctly the foc was not good with them and they had a weak spine compared to my other crossbow arrows.I just started crossbow hunting this year after years of shooting a compound and pile drivers were the first arrows I bought. They are "okay" at best if you compare it to say custom arrows. Out of my 6 pack of arrows, only 3 of them shot alike. If I was shooting just 1 of those "good arrows" from the bunch, I would get about 1-2" groups at 30 yards off a bog death grip tripod.
I went and bought spynal tapps from south shore which are custom arrows and with a field tip i was shooting 1/2" groups at 30 yards. It was a world of difference. Now that hunting season is around the corner, I'm only practicing with my fixed blade (magnus black hornet) and I'm still shooting almost just as accurate as my field tips. My piledrivers were not that consistent with a broadhead.