This is a typical situation where someone wants to use a mechanical broadheadas a crutch for shooting an un-tuned bow.You're shooting marginal KE energyfor a mechanical broadhead and you want to do it with an un-tuned bow.That's a disaster waiting to happen.The best yhing you can do is learn how to tune your bow so your fixed blade broadheads and fieldpoints fly to the same point of impact.It's easy to do.