That's pretty whacked! Does it really work on both C-band and ku band?
Since you still have the feedhorn on the c-120 flange for the ku orthomode feed, I'd think the focal point would be way off. That should kill a LOT of signal on the ku side.
I get the C-band bug every now and then. And this is why these experiments occur. But I'm the type of person who wants all or nothing. So if there's any degradation in my Ku-band signal quality, I'm going to shed the C-band portion of this setup. And that's why I'll bet you by this weekend, everything will be back to normal and my C-band LNBF will be safely stored in the basement. That is, until I catch the C-band bug again...