Depending on how long your arrows are, that .400 spine sounds awfully stiff for a 45# bow. Of course if your drawing 30", then your bow is a lot more than 45# and a full length shaft might work, but 125 gr point on a .400 spined shaft just screams "too stiff" to me.
I'll bet if you add some particulars, draw length, weight of bow at that draw length if you know it, and length of shaft, you will get some good suggestions.
As for the point stuck in the fence post, when you get it out, let me know how you did it. I have one buried in a pressure treated retaining wall. I guess I could screw a nut on the threaded end that I can still reach, lock onto it with some vice grips and put a pry bar behind them. It's not really hurting anything in there and I like to have a variety of extra points around to experiment with, so I just bought a pack of points and replaced it.