keep digging on the research. The breaking strength of ascenders isn't really as important as the load that causes them to slip. Then consider the tooth style and consider what a toothed ascender will do to your rope if it slips...ouch! I'd rather have cammed ascenders on my ropes when I have the option.
Take a look at this page. There's more information than you could ever hope to ingest. go to the page where his collections are displayed. Click on the tool of your choice and read what Gary has to say.