Bob: Kind of nice isn't it. Your experience isn't unusual. It's normal. Wood is quite forgiving. There may be minute differences in where the arrow will impact, but most folks won't notice a 25-50 grain difference in point weight with wood arrows. They will drop off a little faster past 25 yards with the heavier heads, but the difference in trajectory under that range is negligible.
There's been an explosion in interest in tuning arrows to the bow in recent years. A lot of folks try to get down the the exact pound of spine that's optimal for their bow. There's no doubt that there is probably one best spine weight to the pound for a bow, all other things being equal. And carbon arrows, which come in a smaller selection of spines, might require more tuning.
What is often overlooked/forgotten, is that most bows will accommodate a fairly broad range of spines quite nicely. Changing point weights is just changing the dynamic spine a little. Can also change it by changing the physical weight and/or static spine and/or length of the arrow. As long as those changes aren't dramatic and are sort of mid-range for a given bow, all of the arrows will shoot well. They don't have to be tuned to the nth degree to fly well.
Howard Hill demonstrated this quite nicely. As part of his shooting demonstrations, he would often collect arrows from patrons in the stands. These (wood) arrows were different physical weights, spines, lengths, point weights, etc.,(probably way underspined for Howard's bows) yet Howard would put one after the other in the bulls eye. In short, at relatively close range, they all shot to where they were pointed.