If you have it set to something like 6000 too low for 12S long shot. I can’t see the PCB Does it have 3 shunts or 2. Different fw might be your best shot. Wierd it’s only in foc. Might be worth trying ver 5 fw.
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What was the upshot here? I’m running into the same cogging issue with the SV6 on the slave over CAN. You can see my troubleshooting steps here.
The one permutation I have yet to try is to disable the motor on the “master” SV6 and try just the “slave” across the CAN. Vedder firmware v4.2.
Also, it appears the Maker-X website is now down. 
I switched back to BLDC and all was good.
To be clear. The “Go-FOC” doesn’t work in FOC? WTF?
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Lol, not for me. But I do have to say, when I got in touch with technical support, they were eager to help. I just couldnt be bothered fucking around with it. BLDC worked fine so I just left it at that.
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@nomadic_myke seems like you might just be a payed beta tester for MakerX. By payed I mean, ur the one paying to use their untested HW.
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I don’t have any of their products yet, but I was seriously considering getting a pair of the SV6’s. It is disappointing to learn that people are having trouble getting it to run in FOC - I really like having a quiet board.
@nomadic_myke oh okay, I miss read. would be cool if they did some testing before shipping… or mass production. But the numerous reports of Fets blowing during detection, or broken ESC’s might shine a light on their QC process. The weirdest part is the 4.12 HW ran FOC fine, so what did they do to make it not work on a HW6 ESC? Lol
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I should be able to do some testing in the next week or so with the newest v5 firmware on the SV6’s. I’ll post my results here once I have something to report.
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Any update on the SV6?
Same here waiting for more feedback
Works good on bldc not foc got weird pulsing shit
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We finally found the problem, and the solution was to connect the positive electrode of the capacitor plate and the positive electrode of the battery terminal with a thick wire. As shown. Then add one or more 4.7UF 50V capacitors (as long as the heat sink can be covered) at the positive and negative poles to suppress high-frequency clutter. (Pictured). Then you can solve the problem of instability in FOC mode. We are deeply sorry for this problem.
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50V cap? 
if u running 10S it’d be ok I guess.
I assume that any new orders will be shipped with this problem rectified?
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FSC!
10JEFFWUS
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In fact, a capacitor with a rated voltage of 50v can support more than 100v voltage.