Definately if you are thinking about getting one or the other get the Vari-Zone you will be very happy you did, you can find a proshop or like Awshucks said he would lone you his crony when he is done with it , when I got the Exocet they ceonied it for me with the standard Excal Excel string and I was using the 431 grain arrows GT II`s dont know how accurate it was because it was one of those that mount on a compound bow and the shop operator held it under the bow while I shot somthing I would not try but with that combo it shot 301, so since you ar using the FFF String on the Phoenix and the heavy 474 grain arrows would say you are some where areound the 270`s range just a guess I am thinking of ordering one of the cheap models from caballas or someplace myself , but could think of other thinhs I would rather spend the dollars ,, so may kust go to my local proshop and pay to use theirs, and do some expiermenting,
buy yourself a Vari-zone and take Dan up on his offer you will be glad you did..