Okay, yes, you did switch to rtl… about 2 seconds before impact. Unfortunately that was too late to tell what is going on. Have you flown in any stabilization mode before?
Looking at the desired roll and pitch, your plane places a very high priority on turning home just before impact. The additional bank did not help your pitch recover. Your plane probably needed to pull at least 2g’s of vertical acceleration to stop the dive, and the RTL system uses TECS… that was set to pull 7m/s^2 (0.7g) at max. RTL is intended for returning to launch; not recovering from unusual attitudes.