Kenny, based on my calculation...if Trux's .310 will get you 45# with a 1.5" lam width, a 1.75" lam width (with the same .310 stack) should yield a 52.6# bow.
Thus using the old lam stack calculator, a .295 lam stack would be needed to get you 45# with the 1.75" width lam, (same riser and taper rate as mentioned by Trux).
As we all know mileage varies with different forms, different bowyer styles, etc.