Looking forward to hearing your findings once you get the Skoll. I too have an RT85 with the 2M Blue Cartridge, and a Mani 2. if I can be honest, I didn’t care for the Mani 2. I took pictures and boxed it up on May 17th, according to the dates on the pictures. Currently using the built in phono preamp in my Marantz AVR SR7005, which I find quieter, more laid back and better sound stage when listening on my 2.1 system. The plan is to eventually replace the Marantz (which I run in Direct mode into a 2 channel amp) with a Kara and a Skoll.
Interesting, as I find the output of the Mani 2 deep black - no background noise - and the gain stage very neutral. I wonder if what you experienced has to do with cartridge loading settings.