That's a good thought on skipping mollies.
Be careful reading too much into stocking calculators, they often tend to encourage dense "maximum" stocking. Less fish & more plants means less maintenance, that's a plus
You want happy compatible fish in enough numbers of each that their social needs are met.
You can always add more species or more of a species...but keep in mind
every time you add fish you can risk the health of ALL the other fish if you can't quarantine them in a separate tank. I find it's better to get all of 1 species at 1 time...but I am able to QT them, lol, I'm old & have many tanks...I realize not everyone can do that...
I think you need to prioritize you fish choices by both the 1s you want most & the hardiest of those to decide how best to go forward.