What are you calling straight taper?
I have been doing one side flat then a flat section on the other side for the pad then from that portion tapering to the rest of the length.
NO flat, tapered all the way.
What Max said. Your bezel washers will make up for that tapered wedge just fine.
If you are looking to make a hot set of limbs try a mixture of wenge and paduke cores with a thin maple belly lam.Another one is Zebra wood and wenge, or Zebra & Paduke make a good hot rod too....
The thin maple belly lam is something real common in building carbon backed bows. it helps keep the carbon from shearing or buckling because of its superior compression strength. But this holds true for glass limb longevity too. Kirk