Blazers should shoot great through a WB - at least they do for me and I know several other's that don't have any problems either... I set them about as far back as I can on the jig. Also when you fletch, putting a very small 'bead' of glue on the front and end of the vane can help keep the fletching attached.

Blazer's should be fletched with a helical or a couple degree offset. As mentioned try and post some pics of your arrows. Sometimes turning your knocks helps (also as mentioned make sure your vane isn't going through the black brissles on the bottom of the WB)...