Yes, your employer profit sharing contribution cannot exceed 20% of net earnings as I described, same as you did in 2018.
Your maximum employer profit sharing contribution for 2019 will be 20% of the result of subtracting Schedule 1 line 14 from your net profit on Schedule C line 31. 20% * ($160,000 - $9,300) = $30,140 profit sharing contribution. Add $26,000 for your regular and catch-up elective deferral (assuming no contributions to the permanent employer's plan) and your total contribution to the individual 401(k) would be $56,140. The "36k in healthcare" doesn't factor into it.
