@Corlux Speaking from direct experience, I'm pretty sure body weight, terrain, and rider aggressiveness contributes to the variability of nosedives. I love this board and hope OW sees your post and responds. This problem was present in V1 and in v2 boards. If this forum is any guide, there is lots of confusion and frustration around push-back and unexplained nosedives. (see @kbern post here for an 11 mph V1 nosedive that was recorded on camera http://community.onewheel.com/topic/347/thrown-off-after-nosedive-with-no-pushback-warning-nose-dive-nose-dive )
I usually get push-back at 16 mph but routinely push through and usually cruise at 19" mph. (max for me was 20.6 mph) I pushed through past 16 mph all the time until I had my first and only nose dive, and now i'm pretty concerned about pushing past 16, which is a big bummer for me. Fear of nose-dive has changed the way I ride. :(
I had 108 miles on my board when I nosedived... so, perhaps, I was feeling a little too confident when I nose-dived at about 11 miles in hour with no push back or warning at all. During that ride, I noticed that the board was pushing back at lower speeds with a higher degree of back incline, so that should have been my clue that I was riding harder than usual. (I was riding with a friend who had a boosted board so I was riding in a more competitive fashion :) ) Anyway, my board nosedived and I had not even hit 16 mph.
I sent my logs to support thinking there must be a malfunction, then called support and spoke to Carly. The board did not shut off and there was no error code flashing. She found no error codes or malfunction in the log. She thinks I was just leaning on the front too hard, which is certainly possible, but given the unpredictability, this accident certainly gives me pause about riding past any pushback.
I wish a OW engineer would respond on this forum and let us know what the thinking is around push-back and these, fairly common nose dives with experienced riders. If the max speed of the OW is 19, I'm not sure why we get push-back at 16. The advertised speed is 19. Why does OW want their riders to get push back 16.5 mph on their way to the top speed of 19. Push back at 16 gives us no idea if the board is having trouble based on weight or terrain to avoid nose dive.
My 2 cents for OW engineering: I'd like to see OW get rid of push-back completely--at any speed. The energy it takes the OW to tilt the rider back would be better used to control out of the terrain issue, aggressive leaning, or speed situation that is driving close to OW limits. Put another way, OW should just warn the rider via the app, or with a buzzer/warning/noise built into the board if the rider is within approx 85 or 90% of OW limits. That would give the rider the space he/she needs to correct BEFORE nosedive.