At first glance my first suggestion would be to lose the Television from the sweet spot..That has to have a big negative impact...........
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Well, you might scoot the speakers a little bit farther apart so that you're not quite so nearfield, and just for kicks try toeing them in severely so that they criss-cross in front of the listening position. If you want a warmer tonal balance, you might use even more toe-in or move the speakers closer to the wall behind them or move your listening position closer to the wall behind you (maybe shift everything to the right six inches if that big slanty edge intrudes). You might try removing the absorptive panels that are fairly far away from either the speakers or your listening position, like those ones to the far left; late arriving lateral reflections are often psychoacoustically pleasing.
These are little more than guesses, and even if they help in one area there may be undesirable trade-offs in another. But... they don't cost anything to try!
If you have very good sound already, you could try some tube rolling. Amperex tubes sound very good in the Mantissa preamp...I use 7308's, or 6dj8's in mine. Both have very good sound IMO, the 7308's are focused and vivid...everything in it's place. The 6dj8's are less focused, more bloom...a little more forward sounding.
I have RCA clear tops in the front...(not, as big a deal).
Of course the room is some amount of problem, but you already know that. I suspect the long wall placement and near field listening, are the cause of a more neutral sound, and with less air. (probably not a bad thing in that room)
And you are right....sometimes it is the album, and not the system.
Thanks Dave for chiming in with your comments
I currently have amperex in both positions of the manitissa 6dj8 and 7316 the sound is very good. Part of the neutrality i'm hearing is my Mantissa is decked out with vcaps through out which imparts a very neutral sound and the Sason's are as neutral as can be but are highly musical (Well thought out Kudo's to RSAD guys)
At this stage I was hoping to warm things up a bit...perhaps adding a bit of warmth by way's of a tweak i've heard maple blocks underneath components or a Power cord in the right position could do the trick
Any further opinions appreciated