It’s true that you have to give it some time so switch it’s variable. So it’s not the same like when the button is directly connected the dimmer in which case you can push the button and release and push it immediately again. Maybe share your flows here so we can have a look at it?
I’m not sure if the Robb smart button and your dimmer are both Z-wave? Because then you could also use associations (I think). But let’s start of with sharing them flows 
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