I'm genuinely curious as to why you'd approach the 268 and the 33 differently (not least because I have both in the next few months with my next 33 being in WTP on a 772!)

268 in particular takes off at 9.40 p.m. but gets in at 4 p.m. with an eight-hour time difference, whereas KUL is a 7/8 hour time zone difference depending on season, a slightly longer flight (+90min) but the same landing time.

Having made the mistake of taking an afternoon flight out of LAX in Y and suffered badly, I'm trying to avoid overnights in economy - or at least minimising their effects.