Weak point in this analog system ?

Ad010685 -- phono first.
You mention (Marzio's?) Euridice and a Linto... If it's the Euridice I think it is, it's in a different leadue than the Linto -- excellent though the Linto may be.
Since you're diy-ing I would suggest that the Euridice, with a little tinkering to add a phono stage, {perhaps going overboard using a LR circuit with suitable gain stages} would easily better the Linto and most other phonos by far. There's a chap in Italy who offers matched LR de-emphasis circuits called Stefano Perugini (PAEng design). Can't find his url.
Also check out T Loesch's toccata.

That will give you body, texture and detail, etc.

TT: the Scheu TT is very good IMO. Keep it. OTOH I don't know about the mechanical compatibility of yr arm (BTW, I like that SME) I have always listened to Scheu + unipivot (Tacco, Morch, Clearaudio).

I would agree that the Denon, outstanding for the price, can be bettered (for a higher price).
So, keep it and work on a good phono stage.

The Tacco was slightly better (slightly more neutral & slightly more extended -- probably better mechanical compatibility) than both the cheap Morch and the Clearaudio. OTOH, the beginner's Schroder was better. Please note that in these cases the cartridge used was one of the new line Clearaudio MC that costs $~500. Sorry, don't remember the model. The Scheu had the big platter.
There's s/thing missing in yr post?