I think I see a trend that will make submerged range at various speeds borked. I've tested it with various numbers and all have the same results when combined with the high max submerged speed of 17kts. Battery endurance figures seem to be tied into the code heavily. I believe that a setting of 2/3 is coded to provide better endurance.
Because I changed the default submerged values of the Type XVIII to match the XXI, a setting of 2/3 still provides longer ranges despite the enormous speed increase. I'm not 100% certain on that, but this is what I'm seeing so far. As usual, it's another issue I'm going to have to spend more time working with more in-depth. I know there are ways to work around battery endurance so I may have to inquire with the modding experts on this one.
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