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Welcome to RGB.
Looks good to me.
No you don't need to have that filter in place and you are reducing your transmittable photons, so get rid of the extra filter. You should get a bit more light in as a result and that will help with frame rates.
I aim for 3/4 histogram and try to make every filter the same amount. that means different gain and exposure rates for each filter. That makes for easier colour balance. Astrodon filters are more evenly matched than the Astronomiks filters.
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