Most kit instructions are written to get you to purchase the next kit as soon as possible. Throw them away. Find a process that works for you. Everybody has a cleaning and sanitization regimine that works. If it works don't change it. If it doesn't work, make adjustments. Sounds like you are not happy with yours. Here's mine. When I complete a brew day, I rinse out each vessel and then rub the inside with a hand dipped in clear water. If there are stuborn stains, I will then put a little clean water in the bottom of the vessel and shake in some PBW, which is a no-rinse brewing cleaner. Then I upend it to air dry and put them away. I store them with a paper towel in each vessel to absorb any remaining moisture. On the next brew/bottling day, I bring them out and mix up 2.5 gallons of star san in a spare fermenter. Drop all the small parts into it (tubing, disassembled airlock, autosiphon, racking cane, bucket valve) I also pour a cup of starsan into each vessel that will not see a boil, swish it around to coat the entire inside, and let it sit until I'm ready to use. At the end of the day, repeat. Some people do with good results using a secondary. I'm not one of them. You have described your brew equipment sanitization, but you did not describe your bottle process. In my experience, bottles are much harder to clean. Whenever I share brew with others that dont brew, there's crud at the bottom that I need to scrub out. Do you look in the bottle before you put it away to be sure its clean and dry?