I hear ya
I think any of the oils you listed will work fine in the Bimmer. If I could "will" myself to going 10K OCI's I would run RP or GC all the time in the Titan. But I am conservative and run 5-6K on syn and 3-4K on dino juice.
These Jim Wolf cams have made a big difference on the Titan. Mid-range power band is much wider. I will find out tomorrow how they handle tugging a 19' Key West flats boat (My buddy lets me borrow it).