If I opted for offense here, the only shot that I would shoot is to kick the dark ball to my pocket - pretty safe, and I shape up the 5ball if I make it - I shoot this shot often and am comfortable with executing it...
If I opted for defense here, I would cut the 13 or 11? softly into the 1ball, lodging them together, and have my cueball drop onto the head rail, most likely somewhat covered by the stripe....you do this instead of pocketing the stripe (which with your 4-0 lead, profits Jack more than you), and you now have made the stripe and the 1ball unbankable for Jack, taking away those potential offensive opportunities.
Ghost, how are you going to protect against a bank on the 5 ? For that reason, I liked my shot better as it lies natural to come off the top rail behind the 1. I agree pocketing the stripe (13 or is it 11?) is not ideal given the lead but if I get him snug behind the 1, he is in a bit of a trap.