Someone who knows for sure correct me if I am wrong, but isn't AMOS Creator just an earlier version than AMOS Pro, so everything in AMOS Creator included within AMOS Pro?
As for running it on an A1200, try disabling any caches and/or running one of the several degrader programs that were developed to allow older game software to run on AGA computers, such as the A1200 and A4000.
Every time this subject comes up on the forums someone usually suggests that you switch to a different flavor of BASIC language, such as Blitz Basic, or True Basic. I can only guess that more advanced programmers have identified too many problems or short-comings within AMOS Pro, as it is a very old programming tool that has not been updated in so many years and other BASIC languages have better tools to use.
Sorry this is not more specific, but you can probably use the search function here and at other sites to read the old discussions of the AMOS topic to get more details.
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AMOS Factory is the only (semi) active AMOS forum that I know of and you should be able to get good answers from there. I have not been active there for many months.