The Ha filter can be a problem on even a modified DSLR due to the relatively smaller proportion of red pixels in the standard Bayer Matrix configuration. A debayered mono dslr is of course different entirely and will operate like a ccd mono camera with an Ha filter.
Try the light pollution filter first.
Since you are not guiding, your limited to relatively short subs, unless you have absolutely perfect polar alignment and a good quality mount. Ha, or any other narrowband filters, need long exposures due to their narrow band pass profile. Even with very low noise mono cameras your looking at 300" subs as a indication, althoigh some brighter (in Ha) targets like M42 can look pretty good with just 90" Ha subs.
I would suggest you look into guiding. The NEQ6 is pretty capable if well tuned and together with a good guide setup will position you for fainter objects and narrowband.
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