Yeah it's not consistent on this either, seems pretty sensitive to pressure. Very weird sensation. The solution might be to overinflate them, which would be a tad frustrating as it kinda defeats the point of massive tyres
I left tyre pressure as was, felt better with a bar bag on, but that's what I had in mind with pink bike geo, so was expecting it to be a bit twitchy without.
Not tried it with other tyres much, but will certainly keep a note if it still occurs with different brands.
Possibly, I've had a similar experience on the pink bike, not all the time though.