As Pat said with laminated bows, you need to know the stack recipe thickness, length and shape pretty much beforehand to reach certain weights.
Keeping a log book of the various bows you have produced with all of the dimensions is what will get you your own secret recipes. Be sure to track species, stack order, glue used in addition to the lam thicknesses. You will quickly learn what works and what doesn't and it's all part of the fun and challenge!
What Pat suggested may allow you to save what you have here already, but it will obviously change the appearance of what you had originally planned. Once tillered and shooting, be sure to log all of the details.