I have some PSE radial x-weave 100(.520 spine) and 200(.424 spine) I shoot.They are good lighter weight arrows.The Mambas are a heavier GPI then the ones I shoot.How heavy of an arrow are planning to make.With 350-400 upfront with the Mambas you will probably end up with around a 700+ grain arrow.Thats pretty heavy for a 47# bow.Your trajectory will be like a rainbow with that heavy of an arrow,even fairly close like 10-15 yds.I like to keep my arrows in the 9-11 GPP(grains per pound).What do you plan to do with those arrows?