I have found Swarm Commander to be really useful in catching swarms, especially high ones. I can put a half a squirt of it on a rag on a 20' pvc pipe and get it close to whatever branch the swarm is on, and get them on the rag, so to speak. Works especially well if I can shoot a rope over the branch they are on and disturb the branch enough to break the cluster enough to get them to re-orient to the rag. Then I just toss the whole rag into whatever box I want to house them in. I have also zip-tied a QMP strip to the rag-end of the pole, but I don't know if it actually helps or not.
Anyway, the other day I was going after a swarm and I got a little Swarm Commander on my hand.