I would use 2 minutes at minimum for the post hardener wash. Also, without Sodium Sulfate, the hardening would take place, but not optimally due to swell.

The Bromide at that concentration will inhibit the solvent action if not washed out. Excess Glyoxal will react with the Ammonia and reduce solvent action. So, you see that a good wash and a proper prehardener are both needed.

PE