You have mixed up your "rule of thumbs". That is the (suggested) maximum number of hens per roo to ensure fertile eggs in flock mating. I (and many other breeders) have done pair mating with no damage to the hen (physical or psychological). The problem with a high male to female ratio is that the males have to keep the dominance worked out and there are constant challenges from below. Injuries from the frequent combat are likely and the overall atmosphere is more like a fight club than a family. This does affect the hens and can impact their health and laying.I would definitely get rid of all your roosters since the ratio of hens to rooster is 10 hens for every 1 rooster.
Keeping 2 males that are friendly to each other is usually not a problem, but you should be prepare to get rid of one of them if there are injuries. In fact, I would not hesitate to keep 2 roos with only 1 hen, but I would expect fertility of the eggs to suffer. My best fertility is from pens with only 1 male, even if there are more than 10 hens (I've done 15, for ex), so even that rule is suspect, IMO. I depends on the individual personalities of the birds (and perhaps the breed as well). I still do flock matings with more than 1 male, but my "rule of thumb" is only when the number of hens is greater than 20.
So if you goal is fertility, extra roos are bad, but if you just like to have the roos, an extra roo might work fine, as long as they grew up together and the less dominant one "knows his place".