See attachment - electron current 500 mA.
First spectrum DC,
Second spectrum bunched.
Resolution is slightly worse for bunched beam but not dramatically.
Please note, that the ratio DR/RR is 1:1. 
Spectra are about 4-5 injection cycles each. (and due to the shorter lifetime with 8 scans instead of 15 scans).
ion beam intensity : about 2e7 Li-like
Other settings as before.

-> Resonance is now at the correct energy!