McIntosh MA352 replacement

What you need is a subwoofer I’d you don’t have one @kvpower 

This video is as exhaustive about the LS50 Meta as it can be and you’d learn a thing or two - LS50 Meta Review

Have you tried better tubes?
 It is doubtful the stock tubes are anything but the least expensive tubes Mac could source..
 I would try a set of Genelex Gold Lions for new production or maybe a matched & balanced set of NOS Mullards..
 I also wonder are the Acoustics of your listening room treated to allow imaging & staging to bloom as it should instead of being cancelled out by reflections & reverb?

As stated above, I’d look at the room and speaker setup first.  After that, I’d explore the tubes.  I thought I read somewhere that McIntosh uses re-branded JJ’s that are OEM’d for them.  If so, JJ’s are usually fine, in my experience.  But there are others out there that can be fantastic comparatively. 

If you do decide to look at other integrateds, what would your budget be?

Thank you all for your responses.

No room treatment.
Bass is great no need for sub. Thank you the video link.

What would be my gain on the Gold Lion tubes?

budget for a new integrated would be around 5K.