Simon
I tried it on my KT frame with the TDB .It definitely lifted me further out the water .I put the top hole of the wing onto the bottom of the 2 holes on my back plate & mounted the frame t the normal position of the back plate .I tied the eyelets together on the top of the wing & it still allows enough air migration . I always liked the TDB on OC .Have removed it at present due to another project which the bigger wing gets in the way of

.Plus the fact I cvan't dive at the mo puts things on hold
HTH
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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards