I do not want to sound like a pain but the key is the length of the arrow he will have in the bow.
I shoot the 500 size bemen hunter arrow that are cut to 29 1/2 in length, my bow being used is 50 lb at 28 checkmate firebird, I draw 29 inch. I am using the 125 gr points, with no adder weight of any type. The feathers are 3, 5.5 inch bananna cut fletch. I seem to get very good arrow flight.
So tell me how you identify the need for more weight up front. what do you see as poor arrow flight etc.
Bill