Phono Pre Gain

I have one that provides 70 db of gain for MC. I don’t use it anymore. It’s a great sounding phono stage.

No. Don’t worry. Be happy.

KAB calculator actually shows 64 db to be dead on ideal for that cartridge and it has always been a pretty good benchmark for me in the past. Most cartridges also have higher output than spec'd in real life. 

I'd bet that 64 might sound better than 66 (my preference is slightly less gain than necessary as opposed to slightly more if you can't get it dead on). 

I'd say go for it as well.

I'm going to say that 64 dB is probably not enough for a 0.2 mV output cartridge.  I have the ARC Ref 2SE phonostage  w/ 72 db output and when I had the Ortofon Anna (also w 0.2 mV output), it was not loud enough for me.  I could hear the hiss from the phonostage at the higher volumes, which I hated. I have added SUT's to my setup which has lowered the noise floor and no longer hear the hiss from my phonostage at louder volumes. A lot will depend on how loud you like your music.

I would be calling the Sutherland fellow… as I believe that he would likely know.