Don't know what kind of archery training you've had so far, but it is usual when starting out to increase draw length a bit, and also gain a bit more power as your release improves. So you may grow into those stiff arrows over time.
If your arrow flight is okay, and if the arrows are going where you're looking, I would go ahead and shoot them. The downside of increasing point weight to 145 grains is slower arrow speed and correspondingly higher trajectory, which would affect you more at your draw weight than it would at a higher draw weight.
3 Rivers, a sponsor, sells arrows fletched with feathers. They also sell fletching equipment (hint).