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Use a different camera. The KAF8300 cameras have no such issue and your off and running. Some setups simply don't play well together and that's part of the trick of astrophotography. Which items work well with what items.
The 694 chipped camera is great for galaxies, narrowband and small objects but its never going to be a good wide field chip. 11002, 16803 are the kings of that arena and will be for some time to come I predict (no new decent CCDs for years now and none I am aware of on the horizon either). The TEC140 is a premium widefield astrograph not so much a galaxy scope anyway.
With Kodak's ex-imaging division being sold around its unlikely they will produce a new hot CCD as it seems its a struggling business. Sony seems to be hot in development of cameras CMOS sensors but not so much in large CCDs where we need them.
There are thousands of excellent TEC140/11002/16803/8300 images.
Using a filter simply degrades the image and is unlikely to ever work well without compromise. You'd better off selling it (its still a great camera and apparently best suited to fast reflector scopes) and get another KAF8300 camera or an 11002/16803 camera.
Greg.
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