I have a new bow that is 55# at my draw 27 1/2". my arrows are uncut 500 carbons that puts me in the right spine range. Should I start with a 150 grain tip and start trimming the arrow til it flies straight. Then maybe adjust tip weight. 150 grains seems to be right in the middle of the weight range.
http://bowmaker.net/tuning.htm
hope your not in a hurry but this will make your day.
Please adhere to eric-thor's advice and click on the link he provides. It's the best I've seen on the subject.