Am I to understand that you are adding 2 additional male puppies into your household? Are you sure you are going to have the economic and emotional wherewithal to care for what would it be? 2 new - 2 current breeding females and one stud?
Perhaps I've misunderstood, I certainly hope so. I am concerned about your post on a number of fronts. It seems like your "abused" female was potentially breed at or around a year old. That is too young
I personally have a problem with "using" dogs to supplement income, surely there could be another alternative, even if you are disabled. Most of the very good hobby breeders do not "earn" money from the breeding of dogs, as they perform all the necessary health checks, and tests, and offer health guarantees to their prospective buyers.
I as a potential breeder have spent seven years researching, training, testing, assisting in whelping, attended genetics seminars, read and researched as much as I can on my breed. I knew enough when my female went into heat to keep her separated from our males, the least of which is I didn't want an unplanned pregnancy. And of course she was way too young to be bred at one year old.
There is no guarantee that two full males will get along over time. Some do, some do not. Unless you have the space and dedication to keep very separate two full males that decide they don't like each other, then you should not add more males to your household.
I know that you have come on here to ask for "help" in a problem of keeping two bitches who fight when they are pregnant or in heat. But it certainly seems to me that you have not researched breeding lines, breeding health issues, done the required CERF and OFA tests, and have no mentor for Yorkie breeding. I cannot support a "breeder" who doesn't breed for the betterment of the breed and not their pocketbook!
Please stop breeding and find some other means to support your realty taxes!