they are in fact 35mm. Would agitating for 5 sec. every 30 sec. make a difference over 10 sec. every 60 sec. in increasing contrast?
Any general-purpose developer will do it. ID-11, HC, etc. The key is knowing how to get what you want from any developer, rather than assigning too much importance to the "built-in" differences between developers. If you like the contrast, that starts with exposure. Exposure can be tweaked to make your dark areas darker. Then you can develop until you get the lighter areas how you like them.
I'd start by shooting the film as if it was a 500 film, and adding 10 - 15 % to your development.
You can also call the lab and asked what they used. However, it will likely be different than consumer one-shot developers. But if you find out what they use, and come back here with the answer, I'll bet someone can tell you the off-the shelf "consumer" developer that is most similar.
That's the same look I get from HP5+ rated at 1600
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