Sometimes with higher voltages cross-conduction occurs due to fast rise in drain source voltage driving gate voltage above threshold.
I came with this solution. When 15V driver voltage charges gate to 10V C1 charges to 5V. When driver voltage goes to 0V it should put negative voltage on gate and making it harder to cross-conduct and also make it faster to turn off. For example driver cap will be 1u, C1 100n, gate C 10n.
What do you think? Will it work better than adding capacitor to gate, snubber on output, increasing turn on time? As this shouldn't increase switching looses but lower them. Maybe allowing to use higher switching frequency and thanks to that use less capacitors?