I am deciding on whether to pay for pro or plus. For the 5 that are allotted on the Plus membership, can you revise those 5 or does each revision count towards those 5? For example I have a primary home calculations based on 10% down @ 3.75% rate as my first calculations, if I want to revise the same primary home calculations based on 5% down @ 4% rate, will this count as 2 of the 5 calculations I'm allotted for the Plus membership?