Wow .. the bit you have as the 'planing pad' is normally the only bit of the deep V hull left touching the water when chine walking starts .. so all you've got here is a flat section touching the water at full speed at exactly the angle the water hits it .. Hehe... thats gonna be interesting
with a 150 .. Chine walking only happens when enough hull is out of the water when under way at high speed, so balance becomes critical, and when the sea is flat enough, hull contact becomes minimal and over she goes, or when a regular chop dissapears as you enter a flat area round a point for example, hull contact reduces suddenly at a regular fast speed, and over she goes unexpectly.
If you have enough ballast, and trim options, you can mostly correct it .. so dont panick
.. but the simpler answer is to not overpower the hull, or trim and throttle back
The Vid Nos posted above does show it, but nothing like the violence I have experienced, in a deep V hull where on a light 5.8M with a 135 it nearly threw us out of the boat when it slapped from side to side unexpectedly
I have owned a hull where the planing pad was rectangular on a 6.3M and didnt have any problems, but the boat was much heavier with a 150 so was not over powered