I would have to disagree with you.
The CS patches alone you can make on the Origin are incredible. I've yet to make or hear cs brass sounds on software that match the Origin. Other than a Code 8 ($7000+) or a genuine CS-80 ($8000++ and incredibly unreliable, likely to die any minute) there is very little out there that can get you this close to Vangelis style polys.
The Origin allows for (I think) 6 oscs... per patch & 4 should be plenty
Are you using the detune, & TAE? Modifying the play mode settings? JoyMixer?
FLT FM to Velocity?
I generally use my FX settings for EQ & Compression, Then add external FX.
I can fault the encoders, I can't fault the sound- quality is top notch.