I tried with Benz Ace SL , might stick Zyx on if I find some time . I'm not massive believer in loading and I normally stick with x8-10 value of cart internal impedance , so 100ohm in this case.
Ricardo's Riaa is a way off the flat , Salas seems to be much closer with slight 0.5dB rise at 20Hz
Gain measurement is sort of inconclusive , I get something above 65dB but it might be my uncalibrated Tektronix playing little trick on me , I'm surprised it works at all.
I tested frequency response of Benz/Paradise combo , looks quite good +/- 2-2.5dB , unfortunately I had to do it in two stages 30-500Hz and 500Hz-20kHz as 20-20kHz track on my test record isn't very good below 500Hz.
30-500Hz
500Hz-20kHz (green curve)
New almost flat RIAA on the paper looks good +/- 0.05dB , hopefully I'll try this weekend if not it's going to be 2-3weeks time