Yea, like Pearl said, if you are shooting them into something and it doesn't split the arrow and the head doesn't twist sideways, you are good.
One of the best ways is to set the head and stand it on the broadhead tip and spin the arrow. If you have the head not aligned with the shaft and balanced you will notice it clearly at this point.
I copied some Susquehannock copper points I saw that had holes to lash them to the shaft. They were triangle points, but I increased the cut angle and added the tang to strengthen it. I use a couple pieces of leg sinew to lash the broadhead in without glue or anything. I can shoot in the dirt or what ever and if it comes loose, dulls or gets messed up I can change it and be ready to use the arrow in a day again.
I personally think you sound like you just need more confidence in your setup. I would hang a 2x4 scrape over your foam deer and shoot for it. You are not going to hit anything this hard on the deer/elk. The trade point probably won't come out without needing to be relashed, but once you see you arrow destroying wood and not breaking you'll have plenty of confidence to draw down and release on an elk. You'll also learn if you arrows have a weakness and improve them if you do. Just split the 2x4 scraps and get you arrow back out if it sinks deep.