@adsin - Root pruning is difficult to accomplish, especially with larger plants. Damage can be done when not done properly. I have found via trial-and-error over the years that plants are quite resilient when kept in the same pot for decades. Keeping them potbound will retard the growth to some extent and thereby make root pruning unnecessary. Personally, I always look for the easiest solutions to various plant problem. This is especially true since much of my work is done the homes and offices of other people where repotting, root pruning, using pesticides, etc. are not viable options.
Flushing the soil is necessary only if you have been using hard water or have overfertilized. With normal water, a thorough watering is sufficient to flush out any excess mineral salts. Partial watering may cause mineral hot spots to develop.
Some plants, such as succulents, need to dry quite deep into the pot while others such as most Ficus species need water as soon as the surface of the soil feels dry. One size doesn' fit all.
As long as you are watering thoroughly enough that some water trickles through, that should be adequate. That said, surely you can find a larger saucer for it.
