… and some more details.

First thing that was a bit strange while pumping it up was the boom against the leading edge. The boom could actually be less curved and makes a dent into the leading edge on the canopy side
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here you see it from a different angle (not fully pumped and i did not have the boom in the Center)
Additional you see the extra deflation valve and beside the other valve a zip for access to the bladder
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The other side of the boom has also changed, makes it easier to rig
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And a comparison of the booms (left=old, right=new)
It would be nice if they would just write the overall length. Instead you have the add the length of the fixed bit together with the variable side. The writing is also better to read on the old one (black writing)
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The boom is always on the rider side of the leading edge. And on the first photo it is fully inflated to 6 psi. (on the second one not)

I had a quick try the other way round as I was not sure anymore, but that does not work with the blue ropes for attaching the boom. And you are probably right that it might prevent it from twisting when it fits snug - either because it just fits right on the 4m or digs in on the 7m