I have the OS version & Hacker A60 5S V2 using 8S on my Mythos 125 - the 5S is also a 28 pole motor. At the Hacker recommended 25 degrees timing I got loss of sync at 2/3 throttle - reduced the timing to 22 & 23 degess and the loss of sync was gone. I run at 22 degrees, 20x12 PT prop, 8S 5000 packs & get 2700W.


Steve