Is $30,000 to install piers in the addition area of my house a fair price?

I’ve owned my home for around 10 years and in the last 2 it has made non stop cracking and popping noises throughout the house. Visual cracks have appeared in places all over the house. Most would say it is a foundation issue as in the house is sinking. I shot in the house in the basement underneath every joist with a laser level and measured from the joist to the line and all measurements are consistent. I marked the whole foundation where the laser hit and set a monument to set my laser to when I shoot every 6 months. In 2 years the line markings have not moved yet the house continues to crack out a pop day and night. There are no visible cracks of notice in the foundation. If it was the occasional pop I wouldn’t pay any mind, but it’s day and night all hours and seasons and they are pretty loud most of the time. It also doesn’t just come from one area. It is throughout the house on both floor. It’s not the vents either it is the floors and walls. I have had a supposed structural engineer out though he honestly just seemed like a home inspector. I also had 2 foundation companies come out; they just took a bunch of measurements. One said my house is within a 1/2". I have no idea how the other company came up with their numbers, as I have shot in the joists as well as the main floor deck, and everything was easily within a half inch.