The 500's should be close with 125's.The calculator would help a lot.I have some 2016's which are 500 spine and they liked 145 gr heads with my 53# recurve.Each bow and each shooter may be different so you just have to experiment a little.The easiest way to do that is to get an assortment of field tips,125 and heavier and see which gives the best flight.It's nice to be able to use what you already have but sometimes you just have to change something to get the best arrow flight.Oh,and 2117's are app. 400 spine.That's why they should need more point weight.