... Graham did not change the Arch Angle of these tubes.Whaaaat??? They offer longer armwands to reduce tracking angle error but neglect to reduce the headshell offset angle? If so, that's brainless.
All the more reason to follow Philb777's advice: get a Feickert or Mint protractor. I have a Mint. The improvement it made to my alignment and sonics was not subtle. It's a professional's tool. The jigs and protractors supplied by Graham, TriPlanar and the like are toys by comparison.
P.S. Agree with Stringreen and Psag. Anti-skating isn't that important, and in my system it clearly degrades sonics. The longer the armtube the less important it becomes... assuming of course that the cartrdige is actually aligned at the correct zenith angle (which apparently will not be parallel to the headshell... oy!)