I don't think this will help once you've already got sores, but for future reference, I just did 231 miles in three days with zero issues during or after, which is a first. I know YMMV, but what worked for me

Selle Anatomica saddle
Lantisceptic cream as a first layer and Mad Alchemy chamois cream as a slippery second layer
Both Rapha and GL Neo Power shorts