How do you use iZotope RX De-reverb (Learn, Reduction, Tail Length) and how do you avoid over-processed dialogue?

Problem: dialogue recorded in a roomy space sounds distant. Conditions: iZotope RX De-reverb (documentation for RX 6; blog of a later version). Method: Learn on a selection that starts with room tone, is several seconds long and includes the direct signal and reverb tails; it sets Reverb Profile and Tail Length. Reduction is the target wet/dry ratio: larger removes more reverb; negative values add reverb. Reverb Profile adjusts per-band amounts (raise the band where reverb is more prominent). Tail Length approximates RT-60: raise it if tails reappear or early reflections are obvious, lower it if tails and noise floor sound over-processed or dull. Artifact Smoothing controls frequency accuracy; defaults are very high because reverb is smooth in frequency, and lowering it increases artifacts with strong processing. Enhance Dry Signal boosts the direct signal and can help prepare for later de-noising. Output Reverb Only lets you listen to what is being removed. The iZotope blog says pulling Reduction up too far can introduce artifacts and that a little reduction in multiple passes is more transparent than one maxed-out pass. Failure modes: dull, swimmy speech from too much Reduction or Tail Length; removal that changes tone. Limitations: older documentation; current RX module names and AI dialogue tools differ (prior findings cover RX Dialogue Isolate). Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Documentation is for RX 6 (old); behaviour in current RX versions may differ. No measurements. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://downloads.izotope.com/docs/rx6/27-de-reverb/index.html",
      "note": "Controls: Reduction; Controls: Tail Length; Controls: Output Reverb Only; Reduction"
    },
    {
      "url": "https://www.izotope.com/community/blog/reducing-reverb",
      "note": "Controls: Reduction; Controls: Tail Length; Controls: Output Reverb Only; Reduction"
    }
  ]
}