Hi wight! So good to see you posting!! Regarding those voltage spikes, DEL did some real improvements there with new designs, adding resistors and caps. We first used these design tweaks in the driver for the BLF Q8. He's a design engineer and scoped it as well. DEL is not active much now, but others took over and continued progress.
This thread has some details: https://budgetlightforum.com/t/-/44006?page=9#comment-1340928, post #4, #82, etc.