Response to Compensating developers and accutance developers

I developed the film from the totally unscientific SBR 13+ (N- 6)test last weekend in which I used ND filters to create 2 vastly different exposures on the same film to assess whether reciprocity effects helped to increase shadow density in an actual pictorial situation. The bad news is that I ran the test on Tmax 400, which apparently is one of the only films NOT to exhibit contrast increase with longer exposures according to my research from digging through some old Phil Davis articles. Had I known this, I would have done the test on FP4 or something similar. At any rate, I made 2 exposures at each of the exposure time endponts, 2 at 16 seconds and 2 at 24 minutes (with the ND filters) and processed one set of different exposures in pyrocat for 8 minutesand one set in Rodinal 1:150 for 14 minutes at 75 degrees, both in Jobo expert drums. Both yielded printable negatives, but the Rodinal clearly had better shadow contrast, for what its worth. Has anybody on this thread done any analytical tests as to whether extended development in very dilute rodinal does what we apparently are after here, ie good shadow contrast with highlight 'compensation' or shouldering?

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