If you are shooting a Ridgeline 60# bow at a normal draw length, you really want 400 series arrows - not 340's. Unless you want to leave the 340's really long. And aheavier broadhead will allow you to shoot a shorter arrow and still be spined properly. But most people are shooting 100 grain heads. Like more than every other weight put together. And there are more 100 grains heads available than all others. So you might think about building an arrow that is about right for a 100 grain head.Although many will argue that the 125 head is the one due to the higher FOC.

Out of my 61# Reflex Growler, the Easton Axis 400 arrow spines out just perfect when cut to 29" and using a 100 grain head. With a 125 grain head, the ideal length is 28". As other have advised, don't shoot cheap arrows.