Do you have a 3004 Expert Drum? Beyond the facts that it won't work on your CPE2 Plus processor and placing more than four sheets of film in one risks overlapping and scratching, those drums are rare as hen's teeth. The 3004, with its large-diameter chambers, is most valuable for 8x10, where it provides even more reliable results than does the 3005.
I've tried 4x5 in a 2509n reel on a CPE2 Plus and not been satisfied with evenness. In my opinion, the best 4x5 results come from development in a 3006 Expert Drum on a CPA2 or CPP2 running at roughly 45 rpm. Seek a 3006, not a 3004. And, if you've already got a 3004, it should fund your entire adventure.
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