Peggy, yes, that about describes it!I don't think you've grasped yet that it's not necessary to rinse out the lines after every flush...and as a result you're waaaay over-producing this.
This is my first boat of my own with all the RV amenities. (owned a Cal20 for 10 years). My information has been only from these forums, other sailors, and my own deduction. I'm learning as I go.