Well I certainly can’t argue with 25 years of pumping experience! I’ll take it slow for the first few months and slowly increase the pressure once I know the sensation I’m shooting for.
The problem for me with “packing the tube” is that it seems like it’s mainly the glans or the base that pack it, which is larger than mid-shaft. But mid-shaft is the real target. So the 1.75” tube puts all the pressure on the glans, but the 2” tube is way harder to get a seal going— I almost have to pump throughout the session just to maintain pressure. For now I’m trying to see if I can stage it (use 1.75” on the first set and 2” on the second)/