Oh my ***... everytime I post sth. I feel super stupid here and by now I truly hate electronics... I just have to stick to it a couple of months more before it will be over forever... but nevermind it: I would immediately add a second stage to my single stage if I'd understand why such a thing should be able to drive 2kOhms load... do you have any example, a screenshot, anything? I have no idea how I could put your suggestion into praxis.
And as to your post FvM: I have truly tried many buffers from books (voltage follower, flipped voltage follower, super follower and more but I dont know their names... I estimate it should be about 10 circuits at least that I tried.) Oh... I also used the book from Baker, Razavi, Allen & Holberg, Sedra & Smith. It's not like I didn't try you know, it's just not working so I wanted to ask experts for help...