I have read goldtips tend to be week on spine if you go by their charts, which are pretty cheesy at best as far as arrow selection goes.

I have used On Target and TAP and both work pretty well. The best way to use them is to shoot your bow thru a chrono and record the set up, like draw weight, draw length, speed and arrow weight. Then enter the data in the program and let it figure your efficiency. Most of the charts and online arrow selectors just don't take enough things into consideration or offer enough choices to be truely accurate. Especially with the newer faster bows like bowtechs and hoyts.

I also believe the weight ranges listed on the arrows are at 28 inches and you shoot 30 inches. I could be wrong though, it's happened at least once before. This would account for you needing a stiffer arrow than you think since a longer arrows is weaker.

Paul