A couple of points to address:
"I'll consider removing the badge, what did you use to remove the glue residue? I wonder if the wood underneath would be darker as it hasn't been exposed to light."
AHA! A SMART AK'er! You are correct. It is a touch darker, but not objectionable. Smart, in the fact that walnut is the only hardwood to get lighter when exposed to the sun - all others get darker.
I softened the glue with lighter fluid, let it work a while then hit it with 0000 steel wool - won't touch the finish.
"I wouldn't put a felt mat on top unless you raised up the base of the arm gimble too."
I don't see the need to use an additional mat, but I think that you could, and leave the tonearm alone, as long as it has the VTA headshell. You can adjust the pitch of the cart body plus or minus 5%. Remember, when adjusting the knob on the headshell to make this adjustment, you MUST loosen the little Allen head screw in the front of the headshell, or it will not move the cart body - just the spring. After your adjustment is complete, re-seat the screw to hold your setting.