Reading up on Erowid, it seems that most tabs seem to only contain 125ug maximum. I have done supposed '220ug' LSD tabs before and even the first time with 0 tolerance it felt like a clear headed 1mg Nbome trip, not particuarly spiritual / eye opening. The closed eye visuals were not too intense either, open eye walls would twist and zoom etc. Several reviews Alphabay for the specific tabs I tried say they may be closer to 150ug.
TL;DR. Should I order supposedly '220ug' blotters or go with cheaper 100ug since most tabs are 120ug max?
If you did not have a spiritual or intense experience on a 220ug tab--especially if it was street acid (which is currently estimated at an average or 80-100ug) then it most likely was not 220ug.
I would go with the 100ug anyway and take 2-2.5 instead of taking a 220 ug tab. You can always decide last minute to take less but take it from me, you do not want to have just dropped a dose that you now realize is way too intense for you.