Check out fatbeeman on youtube. He makes traps out of coroplast, boric acid and crisco. An oldtimer I know says that boric acid works on the little bastards. Good luck!
I no longer give SHB a second thought. I think the secret is the #6 mesh they use. Many of the oil traps use #8 mesh. A beetle can go thru #8, they can't walk across #6