The best method to shape the crown splash is to edit the viewport gizmo's control points:

Click on edit and the control points and tangents appear.
The tendril spikes can only be adjusted in vertical direction.
The crown's lower and upper base control points can be manipulated in X, Y, and Z direction.

If you need more precision it is possible to enter exact values under "Lower base" and "Upper base"; the values under "Spikes" are for information only (they can be changed, but the values will not be considered).

The "Crown Shape" tab is subdivided into three sections:

Edit

When active, you see handles and tangents for changing the viewport gizmo's shape. You can alter overall size, individual tendril heights, deform the crown, and sculpt splash borders.

Lower base

Here you find the coordinates of the lower base's control points and anchor points for manual editing. Changes are considered even when “Edit” is disabled.

Upper base

Here you find the coordinates of the upper base's control points and anchor points for manual editing. Changes are considered even when “Edit” is disabled.

Spikes

Here you find the coordinates of the spikes' control points. These values are for information only: they can be changed, but the values will not be considered.

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