Problem 1 - You would have to make artificial black holes to ensure that mases are exactly equal, which would well, mean creating stars massive enough to become black holes. <larger than our sun>.
Problem 2 - If there was a blackhole within a few lightyears of the earth, it would cause disasterous effects, and probally kill us all.
Problem 3 - Moving the black holes into orbit with each other, or having both stars orbit each other which is rare enough if there are even any stars orbitting each other that have the exact same mass, and then having them both collapse and turn into black holes at the same time without the effects of the other star before it turns into a black hole <super nova or whatever they do depending on the size/mass blah blah blah> destroying the orbit of the stars, or simply knocking each other out of orbit with each other.
Problem 4 - small black hole doesn't mean easier to control, as far as we know nothing escapes a black hole, which means its not much easier to control, just has a smaller event horizon.