MC, when you say you use psyllium. Really daft question but do you soak it first? And you use a furminator daily on two of your cats? I find that it strips them off their natural oil and their coat actually seems to change with frequent use (not for the better I like to add) so I only use it once a month on my BSH. I thought it wasn't "meant" to be for daily use....
I'm sorry I never answered this post.
I use 1/4 teaspoon of pure psyllium mixed into a small amount of canned food and 1/4 cup of water. I stir it until all the psyllium is absorbed, it makes a gruel. After she eats that meal, I give her another equally watery portion to be sure all pysllium has been washed down the esophagus.
I use the furminator daily. Not for marathon sessions, just a few swipes covering all areas (except the tummy) Their coats are soft and gleaming, the furminator helps distribute the oils. (I just did a cat to check, it takes 9-10 swipes)