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Actually for the camera you are using this is not too bad. I would be more inclined to advise you to buy a colour camera from the imaging source. The cameras that you have mentioned are far too slow and will not give you enough frames per second. You can image from around 90-120 seconds with a colour camera. For the planets speed is quite important.
You might also want to look at not only your collimation (which you should check every session as a matter of course) but also to ensure the telescope is cooled properly. If you are game I have a how to install peltier coolers onto an SCT (follow the link for Earth and Cosmos). This type of active cooling will enable you to accurately determine the seeing, capture great data when the seeing is good and make it far easier for collimation. Any temperature over 0.5 of a degree C of ambient and the mirror will be releasing thermal energy, that means tube currents and a wobbly looking imaging with blurred images despite what the seeing may actually be at the time.
Keep plugging away though. I have spent thousands of hours planetary imaging now and eventually you will crack a good night and capture some great data.
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