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doesn't the meade software havethe ability to transform the image for longer exposures
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Yes, 'drizzle' will derotate on the fly and I did use this feature, but you have to minimise the trailing within each subframe. Because M104 was close to the meridian the field rotation is almost at a maximum and 15 seconds was about the maximum I could use (in fact there still is some trailing in the final image). If I had imaged earlier or later I could have extended the exposure time. I'm learning that when imaging Alt-Az there is a fine balance between exposure time and field rotation.