Mad rash and Chills heal at the rate knicks and nacks do, 1 night in a Q40 bed => 20-40 pts of it gone. You always tank somewhere between 10-30hhp that goes away overnight in order to apply the healing. Quicksilver healing for 13chills is great, Sever mauling for 16 mad rash is fine (elixired sever maul heals at 1/day so meh), and 33 mad rash for blade kiss is alright enough but it was what you were asking for.
"Perfect" non damage potions don't really exist, and the alchemy boosting system flat out doesn't work and needs to be rebalanced if we want it to be relevant.