"Tri-X" has been through so many reincarnations of "New, Improved!" since it was introduced 55 years ago that saying "Older Tri-X"? Yeah, right! it just ain't the same film, beyond having a nominal speed of ASA/DIN 400/27, now called ISO 400.
Also take into consideration WHY Tri-X came along and WHY photo-chemical companies followed up with UFG, Acufine, and Diafine along with Kodak's own HC-110. They all were chasing the photojournalism market, the newspaper shooters and Life Magazine wanabees. "Available light" was the buzz word half a century ago, followed a decade later by "SLR".
It's only in the past few years that we're coming to terms with the reality that you can't have ISO 1200 speed, fantastic shadow detail, smooth mid-tones, and good seperation in the highlights ~ not with the Tri-X/HC-110 combo that was first marketed to the newspaper photogs because it was pushable a stop or two, the grain was OK if not great, it didn't require long times in the developer, and rapid fix was taking over the fixer market, another five minutes saved!
None of this was designed to give Panatomic-X fine grain or Microdol-X smooth grain from your Rolleiflex negatives.
And once more: Developer DOES NOT AFFECT SHADOW DETAIL. Only exposure does that. What the developer can do is give good mid-tones and keep some seperation in the highlights when you develop for too long. You can end up with a printable negative, perhaps, but empty clear negative areas in the shadows won't gain any detail.