The original trio have become a parody of themselves and bore the tits of me. To me the new guys on BBC do seem to have a chemistry however, as others have said theres only so many old cars to drive up dusty mountain roads.The chemistry just isn't there. You are right, they are trying too hard and they just aren't funny. I've half watched a couple of episodes.
I bought Prime to stay with the original guys...much better. Hardly watch BBC now.