Based on my calculations, I am confident that I meet — and possibly exceed — the physical presence requirement by at least 10 days.
Here’s my plan :
- Wait for another 10 to 15 days before submitting the application.
- Coordinate with CBSA to have the discrepancy corrected.
- Include a detailed cover letter with my citizenship application, along with supporting documents, to clearly explain my physical presence.
@armoured mostly covered your situation. The most important part of that is to be sure YOUR travel history, as reported in the physical presence calculation, is as complete and accurate as YOU can make it.
Most applicants will not compare their own travel history with CBSA records. No need to do that. IRCC discourages doing that. The most important thing is to completely and accurately report all dates of exit, all dates of entry, regardless of the length of time outside Canada, so report even flag poling . . . report the exit and entry even if it was just a walk out on the Rainbow bridge in Niagara Falls without getting to the U.S. side.
Beyond that . . . I do not fully understand the precise nature of the discrepancy you have identified in CBSA records, whether it is about an omission or an inaccuracy, or both. Here again, which I believe is in agreement with what
@armoured has covered, odds are high that as long as YOUR travel history is complete and accurate, that should be sufficient.
But if you see reason to apprehend that IRCC may nonetheless question or doubt YOUR (complete and accurate) travel history, it is indeed prudent to wait to apply with a buffer that fully covers the difference. Moreover, if you are concerned that IRCC may need additional information or an explanation to sort this out, waiting to apply with a buffer in the six to ten week range may be a good idea.
Note: additional information, including explanations, are NOT routine. If your objective is to reduce the risk of non-routine processing, reducing the risk of lengthy delays due to non-routine processing, a good buffer easily covering the differences has better odds of success.
Waiting seven more weeks to apply will for sure not delay getting citizenship more than 50 days.
In contrast, if the processing agent, the total stranger bureaucrat assessing your physical presence, just has questions, let alone doubts about the completeness or accuracy of what you report, so that your application goes into a queue where it waits for additional inquiries and checks, that could delay processing by many months, way longer than an additional ten weeks . . . even if it is just to cross-check the additional information and/or explanation the applicant has submitted.
For a PR living and settled in Canada, waiting six to ten more weeks to apply for citizenship is easy, goes by fast, and for many that can avoid suffering months and months of anxious waiting down the calendar (and avoid the interference that can cause with things like plans to travel, be that for work or holidays).
In contrast, while what
@milon45 suggested should avoid a negative decision (assuming what you submit is persuasive), that is not as likely to avoid non-routine processing delays.
do we need to get the CBSA records to compare against our own travel journal before application?
A PR who kept complete and accurate records should not need to obtain CBSA records.
A good buffer is still a good idea no matter how certain the PR is that they have kept complete and accurate records.
For most applicants a good buffer is more about making it easy for a total stranger bureaucrat to be satisfied the applicant met the physical presence requirement than it is about making sure the requirement is met . . . making it easy enough the total stranger bureaucrat sees no need to make any additional inquiries (such as no need to check with employers, for example, as to accuracy and completeness in the applicant's report of employment history).