I have also Siemens Avanto and after adding sops in dgatesop.lst Conquest receives and transmits raw spectro data without problems.
Besides mentioned SOP's i have also:
RawDataStorage 1.2.840.10008.5.1.4.1.1.66 sop
Check this out and test this - but my CQ server accept this after that modifications - I double check tommorow again, but two weeks ago I had tested this and worked without problem.
Regards
Bart