Add a 2x Barlow. GSO produce very good, inexpensive, quality barlows. I have all three of theirs available: 2" ED 2x (this has a 1.25" adapter), 1.25" ED 3x, and a standard 1.25" 2x. All of these work well with my 14" f5.1 Dob. A great way to double/treble your range of available magnifications, and at the same time preserve eye relief.
Stephen
