Fenrir.Retin said:
Did some testing in tavnazia on this and I did not get any 180% TP meditates. I got 140% and 160% with helm+hands. I also got 160% often enough to say that the chance of getting 180% without glitching is equal to zero.(Sample 120-150)
Increase your sample size by a factor of 10 to 100 at the very least before you try to make a definitive answer.
Most people might not notice 180TP meditates because I would assume the majority of the time we are meditating while fighting, or just not paying attention to our starting TP. Not to mention that unless you're specifically testing for TP gain, dropping TP before each meditate, you can only ever see a 180TP med on the first try from a standing start.