Same here Jack no lock at all on DB 8000. I have been experimenting with C Band these last days and it's rather confusing to say the least with a 1.5 m Dish.
I can receive from 34.5 W right up to 49E (that's the limit Eastwards the Dish can travel at the moment.)
The funny thing is that at 5W the only TP I can pick up is 3727 R 29950 7/8 and although the signal is not bad (42Snr) the picture is rather erratic.
In my tests of the C1W I've found them to be much more fussy on the positioning of the dielectric plate compared to my ESX241. In a straight swap the C1W can achieve a slightly better SNR but the plate has to be aligned more carefully. I've also noted the horizontal axis has 0.3dB better performance than the vertical side of the LNB.
Did you compare results with both LNBs at the focal point or by swapping plates on your avatar setup?