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EFKE has gone out of business and that is bad news. The EFKE emulsion was nearly ideal for DTR. The only other emulsion we know of in 4x5 today that works well is from Shanghai. We have tested dozens of other black and white emulsions.
If you read the various blog posts and what the process needs, it turns out that the Efke high silver content films were essential. The tabular grain films like Delta and TMax don't work, and the current low-silver Tri-X and HP-4 and HP-5 don't work. So far, no word on the Shanghai film.