Unfortunately, it often happens that attempts to kill off spiders leaves the nastier ones behind. I’ve found vacuuming does wonders. It seems they catch on that their intended lairs are destined for invasion, so they move elsewhere.
I had a house with an open ceiling in the basement. After the first major vacuuming, right after I moved in, they came back pretty strong. After about the third, I could almost go a year before I started getting creeped out.