Forsmarts Puzzle Forum

Can someone find a better solution than mine for the following puzzle:
Place the full pentamino set into a 9x17 rectanglar grid.Pentaminoes do not touch ,not even by corner. Also, you can rotate and reflect them. Choose a pentamino to start with and draw a path starting from the circled cell of the chosen pentamino (in case of 2 circled cells, choose any of the 2 cells) and crossing all 12 pentaminoes through their circled cells. The path cannot cross any other cells of the pentaminos. Between 2 pentaminos, the path must cross exactly 5 empty cells of the grid. The path can move from one cell to another through the edges, but not diagonally. The path cannot cross or retrace itself.
Minimize the number N of corners in the path.

My variant has 16 corners.