hi, welcome to the fold :) first of all, being able to complete rjspace means you're good, no matter the time. second, i could name only cca ten people with better time /or the ability to run a better time/ to exit.
i know all the public servers use some small amount of air control, but seriously, don't use it. i noticed it only a few times and it was all laziness on relatively easy jumps :) considering the time you lost on some other places, being able to save 10 seconds on the small window after blue key seems pointless.
the angle of view bug is quite common in zdaemon demos, it's caused by moving/looking around during teleportation. wait without moving a tiny bit after every teleport and you'll be ok. and when it happens, another port fixes the problem. it might turn up at spawning too, but i saw that only in one of ocelot's 1on1 demos, so i assume it doesn't happen to mortal players :)
now, i watched you breeze through the first parts of the map in a perfect way and then struggle at some later jumps, i might have a few hints for you:
the large void superjump: try aiming a bit higher and more 'into the wall' with the last rocket you shoot during the wallclimb. it helps a lot.
the stair islands leading to yellow key: you don't swing the mouse low enough with those straferun jumps. it leads to the rocket exploding still before you and it doesn't give you enough forward momentum.
yellow key jump: from the rear ledge, you need only 1 wallclimb rocket after the superjump. the second one sent you over the YK platform.. it's better to fall short than to have to climb the islands again.
bfg room: it's not really the hard part :) place yourself at the end of the red arrow and run backwards. shoot at the tip of the arrow, but DON'T JUMP. you'll get it reliable in 5 minutes of training.
one more hint: you're good with bfg, but your plasma jumps need some improvement. aim the mouse around much slower, in more fluent moves.
ok that would be enough i guess.
btw you rise an interesting point with that teleport exploit for the 'pure run'. the right way might be to use all the see-through islands and then jump in the direction of the blue platforms of hate and despair :) the question is if this is necessary, because i don't think it will make any time change, both routes are almost equal.
it all depends how strict you want to be with separating.. 'skill jumps' from exploits. in my bfg run, i defacto made a pure record run, because i didn't use any teleport exploits. on the other hand i flew around all three locked doors, which is another type of exploit. well, timeofdeath might have something to say about the matter, too :)