Brian and Shaun - thanks for the interest in dealing with my problem. I probably didn't explain my issue very well, so let me retell the story.
I have had 4 devices registered with iFly for some time. My old S2 tab running the latest beta version, my android phone and a Nexus tab runing stock iFly and my windows laptop running beta. When my S2 died I replaced it with a new Huawei Mediapad M5. My issue arose when trying to register/download my saved S2 settings from the iFly server - as I already had the max of 4 devices registered, I couldn't register the new Huawei tab. Once I deleted the defunct S2 I was able to register the Huawei - but could not sync the layout between the new Huawei tab and the now de-registered S2.
I was able to partially solve my issue by syncing the new Huawei tablet layout from the Nexus tab layout, so for me, it wasn't a problem with different sizes etc. FWIW, the new Huawei M5 has the same screen size as the old S2 and so far has been an excellent replacement - once I got all the instruments back in place.