Create an accurate initial guess using an external stream. Increasing the number of iterations and decreasing the tolerance of error can be useful. Repeat the procedure to obtain a unique answer.

I do not know if you already tried it, but something that usually helps me to solve divergence problems is to add a purge (tee) before the logic unit and first, let all the flow exit to the purge. Then, step by step increase the recycling flow. Also, it is also physically convenient to add a purge. Good luck!