By the sound your getting, or not getting out of your striker Bryan. There are two things that make a striker sound flat, open pores in the wood and to heavy. Lets say you have 10 Birch/Hichory strikers, a very common striker that a lot of calls come with. 7 out of the 10 play great, 2 sound flat, 1 sounds squeaky. They are all the same length and weight. To fix the squeaky one, I'd cut a 1/4" off and recrown it. To fix the 2 flat sounding ones, I'd burn the tip ends about an inch up the peg, clean them up and sand them. Now if you burn it to much you'll have a hard time getting it to play on a slate surface, because it will be so hard that it won't grab and all it'll do is skip.
That is one of the biggest problems new call builder face, is that they turned a call that sounded great, but the next few calls they turned sound like crap and won't play, or they can't get the playing surface in the call because it warped. If you don't turn your lathe down to the slowest speed when you sand the call, you'll heat it up enough to change the grain density in the wood and seal the wood up tight or close it up enough that it will warp the pot when the pores close. If you sand with a fine grit at high speed, it creates so much heat that it will change it.