MCT only used in emergency cases as per airbus , mostly in 1 eng out situations , was a discussion the other day about how at lower levels to meet a constraint one could in theory use MCT to get that extra juice
but on the 30 there is no EXP button as is the case on the 20 so winding down speed down to Green Dot seems to be the best way to go , also really depends on your ISA dev at that point
