I do a super lam like Kenny... Mid limb is a .003 total taper and about 9" from the nock is a .000 to .014" on my super lam... So that is about .0015 per inch tip wedge...
I did a lot of experimenting and if I remember correctly, too thick of a tip wedge will give me more preload and smoother draw but slows the bows speed a little... I think because it makes it bend closer to the base of the limb and you have a smaller working limb area which has to move more limb...
Each bow is different and you have to find the right recipe that works for your design... Factors like taper rates of width and thickness all play into it also...
In my experience with my designs I have found that very subtle changes can really change your performance... I have found that I get best performance When most of my limb is working and only the last 3 to 4" is stiff... If you notice in previous posts most are doing a 4 to 7" wedges which will or may give you a similar effect to my 9" wedge but mine is more subtle taper rate and reaching for a nice consistent bend which I believe gets you the most performance... But again it depends on your limb design, in which a 4 to 7" wedge might work fine with the taper rate and / or radius in your limb curvature that you have going on in the rest of the limb... Plus I don't believe you don't need all that thickness in the last two to 3" of your limb... Unless a bow is whip ended, that last 3 inches is really hard to bend... It's just added mass that could slow the limb down just a hair... But you add up this hair and that hair and the next thing you know you are losing 4 -6 fps... So for those of you doing a 7" wedge I suggest trying a taper for the first 3 to 4 inches and then going parallel the rest of the way...