Those rims are 650C, so I'm guessing you have something like a Dolan Kadet or you've made a mistake.
The old 16H Vento and Shamal 700C wheels are plenty strong, but they don't use normal hubs and spokes. Likewise the 16-spoke Shimano 7700s. When you are pushing the limits of what spokes can do, you really have to design the complete wheel as a system to make it reliable.
I'm happy for 650c to be the hill that I die on, just hopefully not from a broken spoke on the way down...
When you say the Ventos don't use normal hubs and spokes though, what do you mean?
Those rims are 650C, so I'm guessing you have something like a Dolan Kadet or you've made a mistake.
The old 16H Vento and Shamal 700C wheels are plenty strong, but they don't use normal hubs and spokes. Likewise the 16-spoke Shimano 7700s. When you are pushing the limits of what spokes can do, you really have to design the complete wheel as a system to make it reliable.