Welcome to Audiogon, Jessica, and congratulations on what is clearly a system that has been chosen thoughtfully and well.
In
the past I've had opportunities to listen to Acoustats of the same
vintage as your 1+1 Medallions, and your description sounds exactly as I
remember.
If you do eventually decide to upgrade the turntable,
and if your phono stage can handle a low output moving coil cartridge,
be sure to check out the recent threads here on the Audio Technica
AT-ART9 cartridge, such as this one:
https://forum.audiogon.com/discussions/pani-new-art-9-up-and-running
As
you'll see, a number of highly experienced audiophiles here have reported
it to be competitive with cartridges selling for several $K. And I'd
expect that it would be available in Japan much less expensively than
here in the USA. Personally, I've been delighted with mine, it having
recently replaced a Soundsmith re-tipped vintage Grace F9E Ruby.
In any event, continue to enjoy your very well chosen system! Best regards,
-- Al