Make sure the arrows meet the minimum weight requirement of the bow. Shooting lighter arrows can put a strain on string and limbs, albeit 25 grains likely won't not matter IMO. I have found that 9% in weight makes less difference than the arrow's weight forward ratio (google FOC). If the two arrows have relatively same FOC they will fly much the same although the lighter arrow will likely hit higher (flatter trajectory); but by an amount which may not matter at 20 yards. That said, I try to keep the weight of my arrows relatively the same by using one brand/weight...certainly my hunting arrows, to which the bow is zeroed.