Would agree with Dave on the positioning of the "T"s .I have a set of bmcl that is a copy of Dave's & an inch out & it makes a difference .
I use a CD TDB wing with the top of the wing cabletied through the grommets to stop it pushing on the top part of the cl's . I can get a full breath on the surface with wing & dry suit fully inflated .
I decided I hated ots after 2 dives & set about changing & now I would not go back .
With regard to dil & O2 manual add I use the kit that John (
narked@90) made for me
HTH
__________________
Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards