You have way too many spacers on the right side of the hub-axle. Move one or two of them to the left side so that the top-cog (14t) is about 4mm away from the inner-face of the drop-out. There should be just 0.5mm of clearance between the outer-plate of the chain and the dropout when you're in the tallest gear. This will laterally shift the largest cog to the right by 5mm or so and place it right where the derailleur currently stops moving.