The ones that I installed awhile back had the most accurate ferrules that I've seen on a broadhead.Every one spun perfectly with no tweaking on my part.
I would recommend mounting them yourself also.Just clean the adapter and ferrule with alcohol or acetone,apply glue and install.I mount my adapter in an arrow,glue and put the broadhead on,twisting to make sure there is good glue contact.I like to orient all mine the same-horizontal,so I line them that way then press the point into a block of oak,cross grain,so it doesn't stick.After that,double check the spin and set aside to dry.
You can use hot melt but I use a good epoxy like JB Weld.That gives a lot of working time.Let them cure overnight before shooting.