Using foreign work experience from family business for PR-documentation advise

My PGWP expired last year, so I returned to my home country for foreign experience and started working for my family’s small business in a role related to my previous experience.
Since the company is family-owned and my employment letter is signed by a relative, I understand the application may receive additional scrutiny.

To support the genuineness of my employment, I’m planning to include:
• Pay stubs and matching bank statements
• Employment contract
• Tax and pension contribution documents
• Reference/employment letter from the company director (same last name as mine)
• Business registration/license
• Recent invoices to show the business is active
• One confirmation letter from a supplier and one from the company accountant
• Screenshots of the company website, social media pages, and local business listings/reviews
All documents will be translated and notarized.

Is there anything else I should include to further strengthen the application and reduce the chances of receiving a PFL?
I’m also unsure whether items like office photos or business cards add any real value, as I’ve heard it’s better not to overwhelm the officer with unnecessary documents.

Would appreciate advice from anyone who has successfully gone through a similar process. Thanks!