The decision has been made
I've been fighting with one of my bamboo plantings this year: as it got taller, it got droopier. It turns out that this particular variety has curvy culms (canes) that weep, which is quite attractive in the right space. I don't have the right space because of limited room, so I've done several things to help keep the culms more upright and out of my neighbor's garden: pruned the tops to lighten the load, tied culms together, even built a support "cage" to help keep them in place.