I went to my pro shop to get my dl adjusted. I now havea 27" dl. I shoot a 324 grain arrow 219 fps now. I am planning on pulling 60 lbs for hunting. My pro shop said I should get the arrows for 45/60 instead of 60/75. He siad since my dl was so short then a weaker spine is better than a stiffer spine. He said the stiffer spine would cause the arrow to flip end over end. It wouldn't wobble in flight. Which do you suggest?