On the pole peas, you could try presoaking/pregerminating the peas before planting. Take several layers of paper towels and wet them put peas in a single layer and fold the paper towel over on top. Put the whole thing in a zip lock bag, but leave the bag unzipped. When the peas swell, plant them about an inch deep being gentle with them. This speeds up the process and reduces the chance of seedling diseases killing them. Watch the overwatering, seeds require less moisture than you'd think to germinate and emerge.
I suggest also digging up some of those that didn't germinate to see if they are hard, or soft and rotten with rusty brown lessions on them. I'm guessing if you find some, they are probably rotten.
Seed/seedling diseases are the biggest problem with peas and beans.