Contributions to the solo 401(k) for a QJV with a full-time W-2 job

Hi, I am doing calculations for contributions to a solo 401(k) for the first time. While I followed the rules for these calculations, I am still not sure if I did them correctly or if I am missing anything. I have a Qualified Joint Venture (QJV) with my spouse, and I also have a full-time job with a 401(k) there. Our goal is to maximize contributions to the solo traditional 401(k) and make mega-backdoor Roth contributions for the rest of the funds.

Contributions to 401k from my full time W2 job are the following: 
Employee Contributions: $21,531.52 (aggregated across retirement plans)
Employer Contributions: $8,074.32 (does not aggregated across retirement plans)

Spouse does not have W2 job but materially participate in QJV. 

QJV income (before any taxes) for me and my spouse: $167,462 

QJV income for each of us: $167,462 / 2 = $83,731.00
Earnings subject to self-employment tax: $83,731 * 0.9235 = $77,325.58 
One-half of the self-employment tax: $77,325.58 *  0.0765 = $5,915.41 
Net earnings from QJV income:  $83,731.00 -  $5,915.41 = $77,815.59 

And here are calculations for contributions:

Are those look correct? Do I miss something? Thank you in advance for any help.