Sorry, I forgot to add Smeagol to the list of your role models.
6. e5 Nfd7
7. Be3 O-O
8. h4 cxd5
You have gone right to the heart of why chess is such a rich and beautiful game. I have always favoured the c5 line because I never could get any counterplay without it. It is all very well to have a slightly better defensive position, but once the storm is weathered it is nice to have some means of hitting back. I know what you mean about the Knight on e8. I used to play it in more classical positions where the WB was on g5, pinning things on the Qd8, and the w-pawn advanced to e5 so that I could answer exd with Ne8xd6.
Of course if you tell me first that your intention is a direct King assault, I will deploy optimally to meet it, but if I play 5..... O-O you can simply play Bd3 and O-O and force me to indulge in a tactical melee with .... e5 to avoid being slowly crushed. not my cup of tea.
On the whole I favour getting some space on the Q-side and hoping it all comes back to me when my opponent over-reaches his attack

. As they say, one man's fish is another man's poisson or something like that.
5. ..., c5 was a bit controversial when I first used it (in May 1966 - I just looked it up -sad really), but it has stood the test of time and is now part of accepted theory. In fact Nunn and McNab say it "must be considered black's most reliable answer to the Austrian Attack"
All of which is so much hot air as far as finding the next right move is concerned

(for both of us)