There are a number of reasons why you might not be sinking very quickly at the surface.
One is that you have some air trapped in your wetsuit when you hit the water. Pouring some water into the suit while on the boat might help with that.
Another is that you are kicking while on the surface, either to keep your balance or out of nerves. If your feet are below you and they are moving, they are driving you back up to the surface. Crossing your ankles can help you remember not to do this.
A more subtle problem is breathing rhythm. People are taught to hold up their inflator hose, push the deflate button, and EXHALE . . . the problem with that is that, once your head gets underwater, you need to INHALE, and you bob back up. My mentor, NW Grateful Diver, taught me to hold the inflator hose up and inhale, and then as my eyes went into the water, exhale really hard and hold it for a couple of seconds. Combined with not kicking, that was enough to get me underwater to the point where compression allowed me to continue to descend without difficulty.
One is that you have some air trapped in your wetsuit when you hit the water. Pouring some water into the suit while on the boat might help with that.
Another is that you are kicking while on the surface, either to keep your balance or out of nerves. If your feet are below you and they are moving, they are driving you back up to the surface. Crossing your ankles can help you remember not to do this.
A more subtle problem is breathing rhythm. People are taught to hold up their inflator hose, push the deflate button, and EXHALE . . . the problem with that is that, once your head gets underwater, you need to INHALE, and you bob back up. My mentor, NW Grateful Diver, taught me to hold the inflator hose up and inhale, and then as my eyes went into the water, exhale really hard and hold it for a couple of seconds. Combined with not kicking, that was enough to get me underwater to the point where compression allowed me to continue to descend without difficulty.