not going to break it all down...
but I ran mobil 1 in my old integra GSR and it would go for about 8thousand miles before it even started to turn color. it was only about 250 whp, but it was beaten on all of the time. it was an off day if it didn't see 9+k rpm's
so it is odd to me that you guys are burning through it in 2000 miles.

my old 240 used to just get castrol syntec. It just happened to fall when it was on sale pretty much every time.
i'd run mystery oil through it for a little bit just before changing the oil. then a bottle of engine flush. let it sit and drip for a while. pour a little bit of new oil down it to try and pull some more of the old crap out. toss in a bottle of lucus and top it off with oil.
I was running 20w50 for a while, but they didn't have enough one time, so I stepped down to 10w30. noticed a slight difference in the way the engine ran. Got crazy the next time and used 5w20. I doubt it made any more power, but it just felt better.

Ran Motul 10-30 in my bike. it would last between 2k and 4k depending on how I was riding.