I used to use that Sigma lense for model shots. When you got it right the results were superb, but as you said many, many wasted shots before getting the odd great one.
About re-programing the Spits AS3X board for brushless. I contacted Horizon and received this reply:
Thank you for contacting Horizon Hobby's Product Support Department.
*Please do not respond to this email* This email address is not monitored. Please use the link below.
No you cannot the X-port is designed for a brushless system but we never supported the part to make it work.
To reply to this e-mail or to place another Horizon Hobby Support Inquiry, please visit our inquiry form. If you are referencing a past request, please include the following ticket number when prompted: 48,478
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Horizon Hobby Product Support
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Champaign, IL 61822