1st: never spare on the brakes, as you cannot
I was in the same situations, got some used maggies, and god, none of them worked, leaked, explode, oil that went to another dimension... you name it
Then last november I bought a new one. yep, twice the money as the used one. but in the previous ridings I had 0 problem with it, I could be 100% confident
I would say option 1, set it up as good as you can. Then get new brakes.
There might be some Vee magicians here who will help you out