I havent grown either of the parent strains, though the hubbabubba's I have seen have been big girls, so i assume they can feed fairly heavily(might be a wrong assumption though!!)
What i can tell you about MC...i like to start at 1.5grams per gallon and work my way up from there, while watching for excessive dark foliage or early nitrogen toxicity clawing signs. By early-mid preflower you will want to be lowering the dose of MC(i liked around 3 grams per gallon, reduced from 4) and adding in a PK booster and potentially cal mag.