Sorry, I mistyped the amount of the maximum employer contribution as $2,168. I've corrected that to say $2,186.
Assuming that the $2,050 was employee elective deferral and not employer contribution, of the remaining $14,363 eligible to be contributed you can split $12,450 between employee elective deferral and Roth contribution any way you wish and you can contribute the remaining $2,186 as the employer contribution. (Because at your net-profit level your contribution is limited to net profit minus the deductible portion of self-employment taxes, you contribute the maximum by maxing out employee contributions at $22,500 and then make the remaining portion as employer contribution.)
