They still have the Vivid air or coil. Cane Creek still makes them. But You are right, this is a somewhat outdated, non-metric size not really common any more. Fox I didn’t check…
We had that discussion earlier in this thread. If You want to overstroke the frame, recommendation would be a 216x63 shock. You can go Mullet on the rear and / or use offset bushings to finetune the geo. If You can use the full 63 mm stoke, You will get appr. 180+ mm rear travel.
720 Wh is 10S4P (40 pcs) of 21700 cells at 70g per cell. Means 2.8kg for the cells only. Plus appr. 500 g for the housing, BMS etc., so appr. 3,3 kg for the battery at minimum. The 410 Wh battery weight is given by Bafang, 2,6kg according to workbook 2023.
The 720 Wh is not a Bafang battery for my understanding. It’s a specific battery designed to fit into the CEF50 frame. The question is, if the battery supports CAN communication with the Bafang components. My E10 has a battery not supporting the CAN communication, so some details like charging...
I start to believe Your motor problems are caused by hardware issues. My motor runs flawless (with really minor exemptions) since April now, same revision / controller You have.
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It will reduce the trail about 7 mm with no effect on the head angle if fork length stays the same. I doubt that anyone will be able to notice the difference.