high interface latency with Scarlett 2i2 on Mac mini

[IJAM]

Is anybody able to get acceptable latency using a Mac Mini (2020) and a Focusrite Scarlett 2i2?

Hardware:  new 6 core i7 with 16BG memory and MacOS 10.15.6
Focusrite Scarlett 2i2 third generation
Jamkazam latest release, latency patch installed, frame rate at 1

Best I can get is 17.9ms for audio interface latency with focusrite.  I can get down to 7.9ms with 4 year old Presonus Audiobox i2. Still not quite usable, but better

Bonus question - any idea  why the performance of the Scarlett and the Audiobox would have been almost exactly the opposite on the MacBook pro (2015) I was running before? Core audio performance on the Jamkazam interface is green.

Focusrite support has responded but has nothing to offer so far.

I have the exact same Mac Mini and a Focusrite Scarlett Solo and get around 5ms latency.  Two things that helped were to FIRST open up the Focusrite Control app (even though it doesn't seem to do anything, the Scarlett works better in JK when its opened first and left open) then open up JamKazam and set the audio booster to 128 Kbit/s, uncheck Auto Throttle Bitrate, uncheck Auto Throttle Network Packet Rate and select 100 Pkt/s.  I attached a screenshot.