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The problem may be a combination of the quality of both your eyepiece and barlow. Do you know anyone with an Orion Shorty Plus or a Celestron Ultima Barlow then try combining it with your 9mm? Both of these barlows are fully apochromatic and of high quality so your image should improve. Of course it would be great if you could try one of these with something like a Meade 9mm as this would represent a significant improvement in the quality of the optics.
Another thought is that, while we talk about the advantages of barlows ie. virtually doubling your eyepiece collection, they introduce more glass into the light train and as a result reduce the image quality. While this is not such a problem at lower power this effect becomes more evident at higher powers. Its for this reason that people often buy an eyepiece for planetary work and don't simply barlow a larger lense. In this case then eye relief comes into play so your planetary eyepieces are often quite expensive bits of glass and metal.
Hope this helps.
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