Ai navigation in a room full of physics objects

I made a large room filled with lots of physics object in a big mess, crates, wooden plates, barrels, and all in very large stacks, also there are lots of small items to fill up details, like computers and buckets. I've tried to put info_nodes around the place(pretty much filled it up with them x and y) tho the headcrabs I put usually find themselves stuck behind something small like a brick or a teapot and stop moving towards me. They stop at corners of crates as well, which they normally would see me beyond. I have the idea of giving them path corners or something to make them constantly move until they're close to you but that doesn't seem good enough solution to me. Any suggestions?