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Mars is about 8 arc seconds at the moment as opposed to 24 at opposition earlier in the year. Still worth a try though.
In Sharpcap, find and centre the planet using full frame and then reduce the ROI to as small as you can. This will increase your frame rate enormously. No point in capturing lots of black space around the object and this makes an easier job for the processing software. Sounds like you need an extension tube to reach focus with the barlow and with this target you'll definitely need it. When you add the barlow to the image train it's common to have trouble finding the planet again on screen, even though it was centred before. Make sure you change back to full frame initially and boost exposure and gain. Then work with focusing which changes a lot. When iMars is reacquired and centred, then go back to the smaller ROI and adjust gain and exposure.
Finally, are you absolutely sure that's Mars you have there? From the screen shot it's not at all reddish and looks like it could possibly be a star. Have you checked it out visually first?
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