This simulation has now gone beyond offering further options. This is because 0.5:1 should be in use so further thickening is out of the question (for this type of grouting). Hence from here on, you will have to let the simulation decide what to do next!
If you are assuming the use of thinner grout than 0.5:1 the quality of the grouting will suffer, and this simulation will therefore not attempt guidance for that situation after here.