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Thanks for the advice think I need a considerable amount more lead I presume I'm going to need around 20 kiloYou'll need to experiment. Your body and wetsuit are unique to you. Getting it just right makes a big difference.
I had to tweak my weight quite a lot myself recently as I dived in different wetsuits on alternate days: one old 5mm and one new 5.5mm. The latter was significantly more bouyant. I carry more lead than you.
One day I forgot to bring my weight-vest, as it was drying. Fortunately I carried extra belt weights and was surprised that one big one (3.5lb?) and a smaller 1kg Alton weight (2.2lb?) compensated quite well for the lack of vest.
I suggest that you buy at least one weight that can be quickly added or removed, to make fine adjustments. I carry an Omer lead that is moulded around a long line clip, which I attach to my float or a D-ring on my belt, depending on need. I found it quite useful but there may be better weights available for this.
20kg sounds too high. Add weight gradually, don't suddenly up it or you'll be nailed to the sea bed. I expect 10-12kg will be closer to the mark. Be carefulThanks for the advice think I need a considerable amount more lead I presume I'm going to need around 20 kilo