Zuts
Your imaging from almost Bortle 9 skies there in the inner City , so a Duoband filter would definitely help with emission nebula like M8 ( don’t need filters for globular clusters )
Still a good effort from where you are and Startools should be able to bring out more in your data
Do you stack your subs using Deep Sky Stacker ( free) ? If so then your halfway there. I’ve been using Startools for 3 years from Bortle 7/8 suburban with great results
What version of Startools are you using ?
If your interested, pm your email address and I can send my procedures for Deep Sky Stacker for Startools and Startools workflows to get you on your feet
Happy to offer help where I can
Cheers
Martin
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