If you're in Langhorne, you probably will only pick up the west system when conditions are just right. I'm on the east end of the county and rarely pick it up on my scanner (and I get bonked on my portable when I tune to a west talkgroup). When I drive closer to the east/west dividing point (roughly rt. 353) things get clearer. (I didn't vet your control channel freqs but I assume you're using what's in the DB).
Rt. 353 or do you mean Rt. 363