Here is one possible solution: woofhomepage-good_JHSv1.hype.zip (1.3 MB). It appears to do the job in my limited testing.
General concept: Create a new symbol for a particular layout.
For the iPad Landscape layout I created a new symbol called "bubble landscape" and then copied all the elements properties, timelines, etc. from the "bubble" symbol and pasted into this new "bubble landscape" symbol. I then recreated the rotation of the bubble speech origin "pointer" ("logoblacktri" & "logowhitetri") for the iPad Landscape layout (not perfect but it will serve our demo purposes here).
At this point You can eliminate the original "bubble" symbol from the iPad Landscape layout. I have kept it in place but made it "hidden" via the Hype timeline element list's "eye" icon (turned it off).