I hear you about the spiders giving you the creeps. A couple of years ago, we kept finding *huge* spiders - I'm talking the size of half dollars (including their legs) inside my house. And they were fast. We decided to spray the outside perimeter of our house and that helped immensely, you might consider doing that instead of (or maybe in addition to?) bombing.
This week we found a new one - an assassin bug - inside the house. That thing was scary looking!