You can always shorten your arrow to loose some weight and increase spine. I have a 30" DL and shoot a 27" arrow with a QAD rest. You could also contact GT and ask for their 85/105 (not sure about the 105)series arrows. I was told by a friend that they make the arrows for long DL's and heavy tip hunters. They're probably about a grain per inch lighter than the Eastons.

You can also download a trial version of Ontarget2 from www.pinwheelsoftware.com and run your bow set-up through there to get arrow choices as well as play with your options.

I really wouldn't worry about it though. That's bow is still shooting faster than many people's bows with lighter arrows.