Being based in HK and flying mostly DM and GO heavy routes (PVG, SIN, TPE), I have to say there has been little difference between SL and GO. Once every three or four flights you get a greeting from the ISM, but besides that I haven't seen much of a difference. On op-ups, I actually feel like I got more when I was SL!

Having said that, you're so close to GO anyway. I would just go for it.