proportional sub not proportionally setting non-intensity parameters

I've used proportional subs for busking things like gobo rotation speed, but this isn't working for prism rotation. I have 2 subs in the same show file with one controlling gobo rotation speed and one for prism rotation. each sub has only their respective parameters recorded at their max value, with the intention of using the fader to set the desired speed. this works perfectly for gobo rotation, but with the prism rotation, it is snapping to its max value as soon as the fader hits 1%. both subs are set up the exact same way with the exact same settings. not sure if I'm just missing something or if this is a bug, but I'm going a little crazy trying to figure this out. 

running on eos 3.1.1 build 6

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