To me baby powder did not work. I never got big or small blisters, but burning sensation with slight redness caused irritation.
So, I changed to Castor oil.
Castor oil and "SMALL" vacuum cup 33m made a huge difference.
I don’t use silicon cap for glans. I am able to do 3 * 1 hour sets of vac extending without any slippage and any blisters for the past four weeks.
I outlined my method.
Uncut: My ADS vacuum hanging method - No slippage - No Blisters yet