Did I mess up development with Diafine?

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This won’t help but I don’t have access to the scans right now, I’m not at home.
But I just developed a roll of Tri-x in diafine for 3+3. I rated the Tri-x at 1000iso.
What I expected was a fairly flat negative with lots of scope to edit, potentially looking the same as Tri-x rated at box speed.

Whilst the scan did seem fairly flat albeit a little dark, adding contrast essentially removed a lot of the mid tones and crushed the blacks fast. I do like relatively contrasty black and white photos but I’ve pushed HP5 to 3200 before and developed it in Ilfotec HC and even that had more mid tones once I’d edited it to have some full white and black tones.

Then I remembered I used the Diafine straight away after mixing without warming it to 20 degrees. The water was so cold that I couldn’t hold my hand under it for too long.
Plus I also misread the data sheet and thought it listed Tri-x 400 as pushing to iso 1000, it actually read Tri-x 320…! However it lists Tri-x 400 as being pushed to 1600 with the same development time as 320 to 1000 so that’s probably safe.

It’s hard to say without seeing the scans but I can only think of 2 options. Either I under exposed the scans by a high margin, however as Tri-x400 pushes to 1600 based on the 3+3 development and I shot it at 1000 that’s probably not why, I technically gave it an extra half stop of light.
The second is that the developer was so cold that the film was underdeveloped.

Annoyingly I’m out of film for the moment so I can’t do anymore tests. I rarely use Tri-x so it’ll have to be HP5 next time
 
In the tone curve "all three" button move the righthand point, the one at the top (for the highlights/whites) closer to the left before you add the contrast. It might help to preserve some mid tones.
 
I can't verify this at the moment, but one developing agent simply has no effect below 54 degrees F. Many developers use two agents, one to compensate for the actions of the other. I have no idea what Diafine has in it, but the temperature could have a significant bearing.
 
In the tone curve "all three" button move the righthand point, the one at the top (for the highlights/whites) closer to the left before you add the contrast. It might help to preserve some mid tones.
I’ll have more of a mess around with them tomorrow. They aren’t unsalvageable, they look like they’ve been heavily pushed, they just don’t look at all how I expected they would.
 
I can't verify this at the moment, but one developing agent simply has no effect below 54 degrees F. Many developers use two agents, one to compensate for the actions of the other. I have no idea what Diafine has in it, but the temperature could have a significant bearing.
I’m guessing it’s the temperature myself. It’s not strictly Diafine, it’s Bellini’s version from Nik and Trik. I had a look at the guide they provide for different films and Tri-x is listed as 20 degrees and TMAX 100 22 so it sounds like it needs to be at least reasonably correct if it’s being that specific.
Delta 100 has 2, 24 degrees if you pull it and 20 for a push
 
So this is an example. With zero editing it looks hugely flat. The edited version is edited so that the highlights and shadows just barely clip. There is some mid tones if you play around with it but to me it just looks like film that has been heavily pushed, which is not really what Diafine is supposed to deliver, as far as I'm aware anyway. I dont actually hate it but its not what I was expecting to get
 

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