This is a really simple way to reduce crashes.
When you turn on your hacks, leave Vac OFF until after you are in the map you want to vac. The biggest cause of the crashes for me seems to have been loading a map with the vac turned on.
noname123 originally posted it on his tut thread, but it is buried under tons of posts. Hopefully posting here will reduce the number of "why am I crashing" threads.