Did the bow draw it's rated peak weight for you when you first got it and now it won't?

How do your brace height and axle to axle length check against the factory specs for your bow? If the a-to-a length is longer and brace height lower than they're supposed to be then either your string/cable still has some snot left to get twisted out of them OR they're the wrong length and need to be replaced.

If the a-to-a and brace measure at spec, or if you've twisted up till the brace is more than 3/4" higher and a-to-a more than an inch shorter than spec, and you still cannot get the rated draw weight out of it, I'd send the bow back to the factory.

I will add one exception to that... and this is why I asked at the beginning if the bow has EVER drawn it's rated peak weight for you. If your bow has a cam with adjustable draw length over several inches, and if you're shooting that bow set at one of the shorter draw length adjustments for that cam, you probably will never get the bow to draw it's rated peak weight. You're simply not putting enough bend in the limbs to generate the poundage before the cam(s) roll over.