Keep at it. It sounds like the roots of the behavior you want are there. fjm's idea to make playing with a new friend the big jackpot is great.
We are lucky to be near New York City, so we have lots of venues to do all sorts of dog sports. Post some agility video if you get a chance. I would be interested to see similarities and differences to how we do it here.
Lily AKC: CGC CD HIT CDX RN RA RE RAE RAE2 RAE3 NAJ NA; APDT: RL-1; CPE: CL1-R, CL1-H, CL1-F, CL1-S, CL1
Peeves AKC: CGC BN RN