The Moki 180 is probably a very good choice. heavier than the os 160 so that should help eliminate the balance problem. I kind of feel like the os 160 underpowers this plane too, of course Im getting used to 50 gassers on 27% airplanes and everything else seems kind of underpowered now. I have CF gear that a guy made for me coming in very soon. (this week).
He said he wasnt real happy with them cosmeticly but they should add a little over an inch and a half to the gear. He made more for sale and when I get mine in, and can look at it I'll let you know about it.