Addition Foundation Issues with Screw Piles

Issue - the drawings call for screw piles 4" from the house with a grade beam, however, there is a 6" footing under my existing foundation.

What are my options? Any others? Looking for simplest and cheapest. The excavation has been done and we are at a standstill until I can figure this out. Engineer not responding or offering any solution to his design.

1. Put screw piles back a foot or so along with grade beam and cantilever tiny part attached to house

a. Is this easily doable? Without causing a ripple effect to the rest of the build.

2. Put screw piles back a foot or so and enlarge grade beam on the house side

a. Is this easily doable?

3. Cut footings where screw piles are supposed to go

a. I'm concerned with this affecting my house and the existing foundation.

Thoughts?

4. Dig large holes where piles are supposed to go and then piles can be angled to get under current foundation

a. I'm concerned with this affecting my house and the existing foundation. Thoughts?

5. Eliminate 2x6 wall and supporting beam/piles on house side

a. I was told my current foundation would not be able to handle the weight of the new addition.

b. I have 2x4 walls and was told the addition needs to be 2x6 walls for insulation code.