I would say from a bioload PoV that will be fully stocked when everything gets to adult size and filtration should be OK.
Dont go 1M/1F on the swordtails.
I have 4 angelfish in 200 litres (50g ish) and i think its too many for the tank size. 2 of them paired up really well, but one of the others doesnt get along with the paired female and they have to be occasionally separated (although ive not an issue for a few months). The 4th is stunted and keeps to itself, but otherwise seems OK. Your 6 in 75g scales up similarly. Something to keep an eye on.
I would consider losing a couple of angelfish and adding a few more rainbow fish.