Training day today. I took 4kg's off last weekend. This helped my position and movement in the water massively but highlighted my need to improve buoyancy control. I had thought my buoyancy was good but now I've fine tuned my weighting it looks clunky and heavy handed. So in we go today, @ 6m following a line that rises and falls maybe 2m as it crosses the seabed. Bit of current. On the line and away we go.. I struggled to stay on the line. Trying to hold position above it using my lungs to maintain depth was difficult and not always successful. I use my wing for buoyancy control, only putting enough in the 'suit to give me flexibility. That said, the first thing I always vent is my Drysuit. It's a habit that I've grown into. Usually if I'm going up I'm coming out, plus I like to keep the suit snug. Make the suit feel right then fine tune with the wing. First I lost position on the line, then my balance, then movement became ineffective. So. Get back to depth. Stabilise. Go again. And again. There is undoubtedly a sweet spot with buoyancy and you need to work at it when you find it to make best use of it. Very, very frustrating. I'm not happy with myself today.