Both versions now have a night-and-day difference to the original. Much improved. Good going Paolo!
But ... (well you just know I have more to say, lol) ...... ready?
Teldex
In your latest Teldex version I'm still hearing what is for me a somewhat irksome, strong, definite and unnecessary confinement of 3D acoustic space. The sound (to my ear) too obviously highlights the walls and ceiling of Teldex and nothing beyond. This has almost nothing to do with the reverberation time (RT60) of Teldex and everything to do with how the ear perceives 3D space. It doesn't matter if a sound bounces back and forth between two walls 5 metres apart for 1 second or for 10 seconds, our ears still get the same intuitive sense of how far apart the walls are.
On its own, MIR's Teldex convolution reverb truthfully informs our ears: "there's no escape past the Teldex walls and ceiling". Synchron Stage would sound a bit larger but would still faithfully let us know we're in a confined space much smaller than a typical concert auditorium. (Btw no, I'm not a claustrophobic, lol.)
BUT .... I've just tried out a very simple 'Band-Aid' fix. I've added to your latest Teldex mix a small amount of convolution reverb of the RAH. Now the Teldex confinement, although still there, is no longer so annoyingly pre-eminent and final. (This RAH reverb is in the venerable old Waves IR1 plugin, named coyly as "The Big Hall" - perhaps because using "Royal Albert" in product names is not permitted in the UK market.)
The RT60 of this RAH reverb is only 2.2 seconds and yet the sound clearly reaches out in 3D space well beyond the confines of any scoring stage. However, adding this RAH reverb can't completely moderate or mediate the very forceful imprint of Teldex in your mix.
Therefore I'd suggest (and now I'm hearing groans from poor Paulo!) a more ideal mix would have even less Teldex, but would include some large-hall reverb, added perhaps to the master bus (or even to a print as I've just done), such that the sound can stretch out beyond Teldex confinement - and without incurring a big RT60 penalty.
From what you said earlier, I must say I'm very puzzled as to why MIR doesn't seem amenable to the perfectly proper practice of treating scoring stage reverb as no more than a component of overall reverb.
Kirche am Steinhof
This is a very strange mix, yet not without its appeal. My first reaction was that orchestral works typically don't really suit such huge and highly reverberant spaces. But then I remembered a performance of the famously beautiful Tallis Fantasia by Vaughan Williams (which is said to have been an influence in Holst's Planet Suite), recorded in Gloucester Cathedral, England. Here it is for comparison (also hoping Dietz might appreciate this):
I'd say Mercury is way too fast-paced and dynamic for the large and stately Kirche am Steinhof, despite the amplitude envelope being reduced to 3 seconds. But at least stage-confinement is gone. And as you say, it's for fun.