Audio Export from Dorico has a really loud noise floor? (using NP4 with BBCSO)

I recently upgraded my NP4 to work with the BBCSO playback template and I'm loving it so far! Except I've noticed when I go to add a final and very basic mastering plugin (Izotope Ozone), with relatively subtle settings merely to bring things up to a commercial level, the noise floor is craaaazy. Is this a Spitfire/BBCSO issue with how they recorded everything (I've not noticed the issue with using just NP on its own)? It makes everything sound like it was recorded in the 50s. I like a natural noise floor just fine but this is just too loud.

Has anyone else with this setup observed this? Should I be turning the instruments up at a different gain staging level rather than a limiter at the master bus? (worth noting I do hear the noise before I add the limiter, though obviously it's not as bad).

It wouldn't make a lot of sense to me if BBCSO as a modern professional library would be that noisy, as people will ultimately bring their recordings up to a commercial level for various reasons.

Also apologies if this should be in the Mix forum, I'm just not sure wherein lies the problem, if it's BBC, NP, or Dorico...

Edit - realized it would be helpful to provide a sample. Here's some basic string pizz where it's incredibly obvious:

View attachment BBCSO pizz noise example.mp3