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Here is my Load script that I'm trying to get to work, but it gets to about a minute and a half and stalls for a minute and then says "operation aborted". I'm assuming it's crashing as it's trying to make more synthetic keys.
I think your main-issue is that you tries to link multiple fact-tables. It's an appropriate method for tools with a relational data-model but Qlik used an associative data-model. And most suitable and officially recommended is to create a star-scheme with one fact-table and n dimension-tables.
This means the facts are merged together by concatenate (union) and/or join/mapping loads. Even if it sounds complicated and not expedient - no other method will be simpler and causing lesser efforts to get a working data-model.