Bad Foundation - Who is right here?

[Ryan Moret]

Hello!  I am in the option period on my first flip home and have come across a bit of a quandary.  The seller and I don't agree on the foundation issues in the home and I am looking for any clever solutions to work through this. 

I want to remove my bias here, so I will stick to the facts:

1. Home had foundation repairs done in 2008 and 2012
2. Seller had a 3rd party engineer do a class C foundation inspection on 3.20.2018 and provided the following:
   1. Overall elevation differential of 4.1 inches.  
   2. Master bedroom had a low points ranging from -0.7" to -3.5"
   3. "The house has experienced settling of the foundation"
   4. "It is my opinion that the foundation remains structurally sound and re-leveling is not required at this time.

During our inspection of the home we came across the following:

1. Noticeable sloping when walking around.
2. Buckling hardwood floors in the master bedroom
3. Cracked and delaminated tile in the master bathroom
4. Cracked bricks and mortar joints on the exterior
5. Home inspector said there is definitely evidence of foundation movement
6. Permapier came out to provide a free estimate and evaluation and suggested multiple piers along master bedroom as well as some other areas of the home.  Estimated approximately 10k in repairs.  These repairs were inline with the work that was previously done in 2008 and 2012 by a separate company.

Now here is the funny part...

The seller and the seller's agent both believe the home doesn't have any foundation issues because of the engineer's letter despite the visible damage and the home inspection and the pier company's investigation.  I am a little caught off guard as any buyer is going to bring these same issues to the table.  It would be one thing if they wanted to argue the amount they were going to settle for repairs, but they are simply negating them all together.  Obviously our rehab budget for this home doesn't have any wiggle room for 10k of piers.

Does anyone have any clever ideas to help convince these sellers that this is going to be an issue with any buyer, so might as well settle it with me rather than someone else?

Thanks!