[DeepThought]

My first advice is to equalize faster, more frequently and maybe more gentle, even if it means inserting an equalization into the duckdive itself. Some people can go the first 8 meters before the first equalization while others (me included) have to equalize very frequently, sometimes even twice each meter for the first 10-20 meters.
Also, equalize once on the surface just before the duckdive.