Before giving up try group tuning . First of all , spin test your broadheads on the arrows you will be using them on . This is very important . If the inserts are not seated squarely in the shaft , the broadheads will wobble and cause fliers .
Number your best arrows .
Now group tune them :
Shoot 2 or 3 at 25 yards , then shoot 3 fieldpoint tipped arrows.See where they group in relation to your fieldpoint groups. They will plane in the direction your bow tune is off . If the BH's are grouping to the right of the fieldpoints , move your rest left in 1/16" increments . Do the opposite if they are grouping to the left of your fieldpoints.
If the BH's group below the fieldpoints , move your rest up or string loop down in 1/16" increments . Do the opposite if they group above your fieldpoints .
This is assuming you are shooting the correct spined arrows .