OK. So my suggestion is to reshape the curve.
But you can start with simply reducing the initial.
I would not take it down to 15* just yet. If you do, it will probably be a dog from off idle to3000 rpmish when you stomp on it.
Here's what you measured.
View attachment 1715766055
Try something like 18* at 500 rpm.
View attachment 1715766058