These recommendations for playing in docked mode with joy-con grip. I have been trying to get as close as possible to Splatoon 2 feeling.
For playing in tabletop mode with joy-con grip increase gyro Yaw-axis to 16. For playing in handheld mode increase gyro Yaw-axis to 20 and maybe aim assist.
P.S. Even with this setting aiming is a bit wobbly and loose. Sticks are too sensitive. The game looks impressive when running in handheld mode: a toy Overwatch on the Switch. In docked mode it’s clearly visible that this is a port.