I looked at your photos. You are doing well! I am not sure which aspects you want to improve with a new camera. It seems to me that some of your shots are a bit underexposed, although that could be the look you intended; what are you using for strobe(s)? Also I think some of the shots could be improved by being a bit closer. Might help with exposure as well.
I have usually transported all the gear (except camera body and lenses) in a Thinktank Airport International. That required the 170 to be packed vertically in the bag which is fine if the bag stays with me. If I anticipated that the bag might get checked, I moved everything into a Pelican 1510, and would put the housing or a port or two in a smaller carry-on bag. When I upgraded to the new housing for the E-M1 Mk ii, I found it just enough taller that the Airport International bag is not working for me. For now, everything but the housing goes in the Pelican and I put the housing in my "personal item" that the airlines allow and that also carries the camera and lenses. Alternatively, I could get everything in the Pelican except the 170 dome and carry that with me.
When I choose to leave a lens or two and a port behind, everything fits better, but I often take three lenses and three ports along with the strobes and all the bits and pieces.
I try very hard to avoid ever having my dive photo stuff get checked as luggage except when I have to take one of those small inter-island type planes.
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