I've only ever used 1x1 binning with my SX H-18 after seeing horizontal blooming at 2x2. This is caused by the shallow horizontal shift register on the KAF8300 and can be reduced somewhat by dropping gain (some cameras appear to do this automatically when binning is used). There are some examples here:
http://www.pbase.com/wjshaheen/horiz...he_kaf8300_ccd
Looks like a different issue to what you're talking about, Troy, but you may run into this as well. I don't think the KAF8300 design is well suited to binning.
Cheers,
Rick.