Grinding a little off the ends is the better choice imo, but when you do it, try to make them as consistent as possible. If you can make a jig and place them in a surface grinder, so they all cut together, then do, then match the weights with a balance.
If you DON'T have a surface grinder, Here's a method that'll work:
Take a small pan, or even one made of a piece of aluminum foil... place a piece of steel in the pan that will allow you to place the weight with the pivot and force surface up, while the weight's nose sits on the bottom of the pan.
Pour some dychem into the pan, about 1/8" deep. Remove the first weight, and place the second, then the third. Now you've got three weights with dye to the same height.
Use a 4" grinder with a flap disk to carefully skim back the weight to the dye's edge.
Dip a machinist's ruler into the dye, and write down how DEEP the dye is.
Permanent marker- Letter the weights A, B and C.
Get out a precision balance, place one weight on one balance. Write down WHICH of the three is the heaviest, and which is the lightest.
Place the lightest on the balance, and lightly brush off (or file) a little from the heaviest, until it matches the lightest. Repeat for the remaining weight.
You'll have to install and test to determine how much faster the governor will reach neutral point. Do yourself a favor and WRITE DOWN how much you took off, and what the resulting RPM was. As you remove more, the change will increase, because the weight is tapered AND you're getting closer to the pivot point. This chart will allow you to predict how much more you'll need to take, to get to your target speed.
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