I have two bows, a widow 51@28 and a swan 55@28 and I shoot gold tip 5575's. My arrows are 29.5 inches long, and I use a 100 grain brass insert up front. I use 200 grain tips. My broadheads are any 125 with a 75 grain steel insert. The 300 grains up front gives roughly 22% FOC which results in a very hard hitting arrow that flies beautifully out of my bows. Even in high wind the tail might kick out a little, but that 300 grains keeps it going right to the spot.
I dont know if this setup will work for you, but it sure works great for me. What you could do is front load the tips and use a full length arrow. Cut it gradually from the rear, replacing the nock each time, till it flies perfectly from your bow. Then fletch it. There you go. Or you could start with the length you want and then fool around with the tip weight till you get it right and teh arrows fly great.