I'll try to ask this without rambling,so here goes. I'm shooting full length Easton 340 Traditional Only Arrows with a 125gr. tip. They only offer a 300 that is stiffer spine. Mines 10 gpi and the 300 is 10.1. I want to shoot heavier tips. Is there that much difference between the two to go up very much in tip weight? I guess I don't fully understand the correlation between gpi and spine,but I know there are guys on here shooting heavier bows than mine and using heavy tips. My bow is 55 at my draw length and shoots great with the above set up. My question is with a full length arrow and about 175 gr tip what arrow would you go with?