I did that earlier this week 
Check out the angles of the lead ins on the ones up above in this thread - they sweep in at a 60 degree angle (IIRC) so there’s a curve to them. Then in the red-arrow-explanation thread look at those lead ins - they come straight in without the sweep. That’s an example of how the lead in radius, sweep angle and distance work together. You can play with those in order to get smaller parts to cut where Fusion might not be able to apply the same parameters to a small circle that it does with larger ones in your design. Depending on the cut line you’re trying to get you may need to play with bringing it in shallow but maybe leading out at a sharp angle (you can make lead in & out the same or different parameters for each).
Spending a couple of hours just playing with different settings can pay off when you’re trying to get a tight tricky part to cut.