Your home kit is not as accurate as many professional methods. If you are working for an industry where security is very tight, then they might pay for high end tests. Some tests can also detect masking compounds, but again this is unlikely for most jobs.

I always suggest going cold turkey for a while so you can test clean. If you are still unsure then its a good idea to use a masker or diuretic or dilution or a mixture of techniques.

A failure due to being too diluted just means a retest. A failure due to THC detection could mean the job. It can also buy you a couple of days if you have to retest.

PS: Based on your description I wouldn't worry too much. The chemicals they test for are found naturally, so falling in that natural range is not suspicious nor considered positive.