With those cichlids I'd go to max 4/5 polys. They do get pretty big and thick eventually. I wouldn't push it 

The most I'd do is 4 polys. Definitely don't want to push it. My 135 gallon is already pushed. This one I'd like to be a fairly easy tank to manage. I just wanted to make sure that if I DID do 4 it wouldn't be pushing it too much.
Those are beautiful but I think I have my heart set on an albino and a polli. Though the moke's are very pretty too.You should be fine with that in the 75. You keep you tanks up and that is not bad for the upper jaws.
A couple ideas for you:
One poly I did enjoy having but it was super mean was my palmas palmas.
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Also liked my gold dust but it was a hider so you didnt see it too often
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I had an albino that I loved but It just would not go past 7" and at that point I started down the dark path of big poly with a weeksii. I do miss that one because it was so active. I never kept a polli but did the palmas palmas instead. From what I have heard from others the polli are a nice active poly. Sounds like you have some nice polys in mind.Those are beautiful but I think I have my heart set on an albino and a polli. Though the moke's are very pretty too.
Definitely, I prefer the more active ones. I like to be able to see my fish. though i guess that's not a problem with the bigger guys since they are usually larger than most of the decor in the tanks.I had an albino that I loved but It just would not go past 7" and at that point I started down the dark path of big poly with a weeksii. I do miss that one because it was so active. I never kept a polli but did the palmas palmas instead. From what I have heard from others the polli are a nice active poly. Sounds like you have some nice polys in mind.
This is mine, but i dont have the roselines and bala sharks no more since i traded them for the 2 odoe pike