Hey Nezil, have you seen this from Dinan? It's their new (non-M2) N55 flash. The only reason I thought it might be of interest, maybe, is that near the bottom of their features bulletpoints for this flash is "no hesitation between shifts." It might be worth a follow-up with them to see whether they have addressed your issue in their recent tune...
https://www.dinancars.com/products/s...V1utY2xZDIA7K4