Triton base their entire methodology around NSW levels (with a few exceptions, due to ICP LoD - Iron, Iodine etc). That's 35ppt. Therefore, there is no logic in providing different set-points for different salinity as they are using NSW as the reference.
If element symbols are really a problem, then you do know that you can just hover your mouse pointer over them to get the full element name, right?
Regarding corrective actions, Triton certainly give you full information on what to do to get back to the set-point levels, with measurements and schedules based on their knowledge of the maximum recommended dose in any one period.
It's difficult for any ICP provider to know exactly what the source of contamination is. Triton certainly give you suggestions and my experience has mainly been with users of other tests coming to Triton's support forums to get advice. 3rd parties seem to be copying this advice from them, rather than vise versa