hi, thanks sir 
i guess i can answer your question as i insert the weekly update that i forgot to, as the answer is actually somewhat related.
i got outside visitors
and i wasn't doing particularly well, so i ended up using these things as an excuse to not playing. must stop with this stupid retarded garbage bullshit 
here's the z50 graph after the last update:
Spoiler

standard swongs, runbad? maybe, didn't run good for sure.
but i felt like i was completely unable to find my A-game and a number of regs were actually adjusting well against my loose-spewy 33 VPIP style, which was something pretty unheard of at z25.
that said, while i might have underestimated some of these guys, i don't think that the limit is beyond my skill level. i just need to find my A-game (which i seemed to have lost sight of completely after a few losing sessions) and some confidence 
this is an example of hand that i'll be posting from villain's pov and, the higher you go, the more people will consider calling down.
i actually like his calldown a lot. while i definitely will valuebet any Ax and most Kx, my frequencies are actually pretty out of line in this spot and this is something i will have to be adjusting to keep moving up (i won't go into detail ofc):
PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 52 BB
Hero (SB): 100 BB
Villain: 124.98 BB
UTG: 100 BB
MP: 33.66 BB
CO: 141.54 BB
Hero posts SB 0.5 BB, Villain posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Villain has 7♥ J♣
fold, fold, fold, fold, Hero raises to 2.5 BB, Villain calls 1.5 BB
Flop: (5 BB, 2 players) 7♣ 2♠ 2♥
Hero bets 2.26 BB, Villain calls 2.26 BB
Turn: (9.52 BB, 2 players) K♦
Hero bets 6.26 BB, Villain calls 6.26 BB
River: (22.04 BB, 2 players) A♣
Hero bets 13.32 BB, Villain calls 13.32 BB
Spoiler
Hero shows 3♠ Q♠ (One Pair, Twos)
(Pre 61%, Flop 16%, Turn 7%)
Villain shows 7♥ J♣ (Two Pair, Sevens and Twos)
(Pre 39%, Flop 84%, Turn 93%)
Villain wins 46.48 BB
he actually seemed to have fairly high fold to cbet (>50%) in later streets over an ~1k hand sample, so i wasn't expecting to see this hand when he called river without much hesitation.
so well, the point is - these guys might not be amazing, but they definitely can read things better and have more balls than the z25 guys.
i am fairly sure that i know the adjustments i should be making, but i'm taking a break on this shot for a bit to get some confidence back. so it's going to be z25 for some days
as i said, i think i was pretty far from my A-game for the most of these last days.
so now with that, let's answer the question:
Originally posted by MasochisticDesire
Nice win rates - I have just moved from one limit to the other myself and I am interested to hear what play style adjustments , or what player tenancies, you thought were necessary to result in your red line being b/e at NL5 and negative at NL10. I am aware that it is possible that your overall win-rate may have benefited from a negative red line but it seems suggestive of a change in approach to the limits and I am just curious.
GL with Supernova, will be following.
as you might have noticed, i have a loose-aggressive highly exploitative style, which fits perfectly for microstakes. 
so, in short, i think that the lower you are playing, the more exploitative your approach should be.
to give a better idea of what that means, let's break down my nl5. in z5 i played 42/38 
what that means is pretty much: raise any playable cards, open 100% of buttons and smallblinds, cbet pretty much every flop for half pot and multibarrel pretty much any scare card that turns up. as you may have guessed, these people still don't know yet how to read well, so i can mostly get away with repping anything there is available to rep.
in z10 i cut a lot of opening garbage from early positions, though still opening pretty much 100% from buttons and smallblinds. it's about the same thing but less extreme...
only in z25 i started to find more regulars which make me not want to open 100% from late pos and consider some looser calldowns sometimes, and only in z50 i found more regulars who can adapt to me, so besides playing the opponent i also have to consider my own perceived image.
at least that's my view on things, anyway.
in short, for my style, i guess the main thing is that i have to cut down a bit on exploitation and vpip for every limit i move up.
since you mentioned red line, i guess that contrary to popular belief, my main strength compared to other regulars is good valuebetting/sizing and i don't run many big bluffs for stacks, just a lot of fighting for small pots.
apparently that's enough to keep the redline up in nl5, since they are super tight and somehow still find a way to fold too much postflop.