I’m not clear what you are doing in DEVONthink vs what you are doing in Tinderbox, so it’s not an easy question. Results can be exported in various formats from LimeSurvey – Word, Excel, CSV, PDF, SPSS, XML – and of course one can do multiple exports in multiple formats. If you are going to be working mainly in Tinderbox, you might want CSV which can, when properly formatted**, be imported as multiple notes into Tinderbox.
Recall that survey response records usually comprise demographic information about the respondent, metadata about the survey, and boolean, multiple choice, or freeform textual data. Tinderbox is a very good tool for working with records with such content. IMO, DEVONthink is particularly bad for that kind of analysis since it knows nothing, and cannot learn anything about most of the metadata in a survey response record. I’ve used DEVONthink as a repository for survey records, just to have a place to stuff them, but I usually go straight from export to Tinderbox, with some data cleanup in between as needed.**
IMO, with respect, don’t get lost in trying to align survey instrument <-> export <-> DEVONthink <-> Tinderbox. “Just because you can” is not a good reason for trying to use all the tools one owns.
**Not all CSV exports are created equally, and Tinderbox chokes on many of them. So, as recently discussed here, export to Excel, clean up the data, then copy the data range from Excel into Tinderbox.