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Merry Christmas Aaron, welcome to the frustrating world of planetary photography! First of all, you're making it really hard for yourself trying to shoot Mars now. Since opposition in late July, it has been receding and phasing to a gibbous state, reducing in size considerably. Only the largest of instruments would show any detail on the planet so don't be surprised at the size it was on your sensor. Even introducing a 2X Barlow would hardly make it worthwhile.
Sounds like you don't have enough back focus using the Barlow to achieve focus. Sometimes, depending how far out it is, you can just move the Barlow or camera out a bit from where they seat in the holders. As long as they still hold securely. This may be just enough to enable you to achieve focus.
One thing you could try with what you already have on Mars is to process the video footage in a free download called Pipp. It allows you to crop the video frame so that it only registers the area of interest and not all that blackness you have around your image of Mars.
Good luck! Keep trying, with perseverance and experimentation, youll eventually get there!
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