I am surprised how small a main jet is being suggested. Race GT500 carbs I have cleaned have had 230/240 and 260 mains according to my notes. Interestingly a TD3 or early Tz is typically 280-320, albeit they rev a little higher and are in a higher state of tune.
That suggests that even in a relatively low state of tune, a T500 pulls in so much more air that it creates a stronger signal over the jets.
38mm on a GT750 runs 280-340. I have seen 210s in 32mm carbs on a 750. Nothing as small as 135.
You have more experience with them than I do, but those are surprising small numbers. It will be interesting to see what John's bike wants.