I use FP4 (and the photowarehouse cousin) and tray development. Using a step tablet I have an ES of about 1.78 using the 1ml of dichromate. I did a test on COT-320 last night using 4ml dichromate (still drying).
Using a stained negative for ES. I got 1.6 using 1ml and 1.27 using 4ml. Your ES sounds low. But if that is what it is, it is.