Wooww , these two second pictures taken with the 60 mm show a big difference in quality with the first one ..
Congratulations for your beggining with OMD and wellcome to the lover's club of this fabulous camera
Concerning the buyoancy I use Inon float arm M , and have found a great improvement versus Stix foam that I used previously , I have also a Stix float belt for Aquatica housing ( I used it before with my Nikon D90 ) wich is perfectly usable with the 12-50 port .
This is enough to use the 60 mm , with or without the Subsee magnifier .
But I don't think that it'll be enough for the 12-50 , especially with the Subsee . I intend to order the megafloat arm S , that I could use with 3" ultralight arm if the lenght of the megafloat S is too short .
I have ( in France , so actually far far away ..) two Inon megafloat arm L , but I found them really to big to be use with the small housing of the OMD , elegance matters ;-)
INON Arm System [Arm]