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That's a great result. With longer subs you need to use even colder temps on your CCD. So if you are not already maxing out the temp it can do it would pay to increase the cooling as much as possible. Especially taking advantage of the extra cooling that winter already gives you.
Also depending on your scope I find I get a good gain using 2x2 binning on Ha very often. It depends on the final use for the Ha. If you are doing narrowband and intend to use to show detail then perhaps not. But you could do a blend of 1x1 and 2x2 with the 2x2 picking up more of the outlying super faint neb. You have almost all of it but there is a tad more there. I used a 17 inch scope and 2x2 binning with a .6x reducer to really show it all and its quite extensive.
Greg.
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