I'm 6'4" and my draw length is 30.5", I also shoot a Hoyt Excel. I have tried both the 21" and 23" risers, and all 3 lengths of limbs; short medium and longs. My opinion: I didn't like the short limbs on either riser. Both the mediums and longs felt better to me. I ended up going with the 21" riser and my primary limbs are the mediums for a bow length of 64". I really couldn't see an advantage or disadvantage to one riser length over the other except for the bow lengths each would make: the 21" will give you a 62", 64" and 66" bow; the 23" riser a 64", 66" and 68" bow. I preferred the option for the 21" riser. On a side note, I have found the Excell bow to be a very good shooting bow, smooth drawing and quiet. Regardless of bow type-most will require some adjusting to get it dialed-in to just where you like it-be it an ILF bow or longbow. I haven't found the ILF bows to be any more complicated, or requiring more adjusting than other bow types.