I was wondering whether I can show an executed lease between me and my LLC to make 75% of the rental income stated in the lease count toward qualifying for the new primary residence mortgage which allows me to put down only 5%.

I completely resonate with this and I think many other people do too. 

It's sad that some crooked people are causing issues because they have problems being honest in their business. 

Getting right into it, I have been seeing many posts about people doing the BRRRR method and all of it is very good to soak in.

People think they can use the internet to skip this step. 

I would recommend you reach out to the people who are doing it on-market. 

Some takeaways from him:Treasury Regulations section 1.280A-2(i)(3) gives a couple of ways you can proportion the rental portion of a property--my accountant used square footage.Under section 280A of the tax code, common areas that you also use are considered part of your personal space and unfortunately aren’t counted as part of the rental space in the proportion calculation.

A Comprehensive Guide to Homebuying, it's essential to be thorough and methodical to ensure you're making an informed decision but draw boundaries, it's okay to open built-in closets and kitchen cabinets to assess the property, However, respect the seller's privacy by not invading their personal space, such as medicine cabinets, storage boxes, or clothing drawers,Interior:Architectural style.Bedroom and bathroom count, size, and location.Closet and storage space.Number of floors.Sightlines and general floorplan.Appliance age and condition.Light switches and socket count.Plumbing and water pressure.Natural light and views.Noise levels.Stairway width and type.Porches and decks.Garage and parking capacity.Proximity to neighboring homes.Remodeling opportunities.Exterior:Roof and siding condition.Landscaping and outdoor maintenance needs.Additional Considerations:Take notes and photos during the tour.Use your five senses to assess the home's condition.Ask your real estate agent questions about the home's features, flaws, and market conditions.Red Flags:Overly scented rooms.Water stains and damage.Lack of maintenance.Foundation issues.Sagging ceiling.Fresh paint that may be covering up issues.Final Tips:Be prepared to make multiple offers before finding the right home at the right price.Stick to your budget when making an offer.Don't overlook potential red flags just because you love a home.

I know of one builder that digs their heels in because honestly they can, they have lines of people buying their units so there is no incentive to give discounts.

For me its the following1. copies of my professional licenses  so people can check up on me.