I just installed a new xtr external bb crankset on my bike. The problem is,if it is installed as per instructions , it should have two spacers on the drive side. If I do this then the xt front derailler does'nt seem to have enough throw for the outer chainring. If I only go with one spacer the crank comes pretty close to my chainstay.Anybody have this problem before? Does an xtr fd have more throw?