I’ve found that often it seems like Iconica isn’t responding to velocity (or whatever) when it really is.
The problem (for me) is that the controls, vel meter, etc. are displayed for the ‘selected’ articulation. This is not necessarily the same as the currently playing articulation.
I wish when the played articulation changes that the selected articulation changed with it. You’d also need to be able disable this behavior for the odd occasion you want the selection & playing to be independent (although I have a hard time thinking of when, if ever, I’d want to do that).