massive out of plumb wall

Hi, all.
I hope I can write this post ok as I am currently about as stressed out as I can be.
I took down my old 13mm horse hair plaster from my 1969 built brick veneer house in the lounge room due to a tiny amount of cracking.
I am planning to replace with modern gyprock plasterboard.
I have slowly been working on straightening the walls using a straight edge but just now I decided to check wall for plumb and it is about 20mm leaning out at the top..
I am only doing 1 wall at a time so I can get it spot on and the corners arnt even the same.
I am totally lost now, this house has very heavy concrete tiles and this is an external load bearing wall with those brick ties going into existing wall studs.
I have bought myself enough gear to do it myself but dont know what to do ???

1 : slowly replace existing wall studs 1 at a time with F17 studs ?
2 : I cant remove material as the wall seems to lay outward, but I could screw angle iron to every wall stud to plumb it up ?
3 : install all new F17 wall studs beside existing studs ?

What is the most important wall plate when it comes to plaster board the top or the bottom plate ? or can I start above bottom plate and finish below top plate to keep wall plumb ?

Please help any idea's at all as I am lost.
thankyou
Gary.


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