May I comment about your soil mix without offending you?
Compost by itself is not a good growing medium. Compost is best used as a soil amendment. It adds nitrogen, and minerals. It is too rich and too coarse to be a good medium by itself.
When I say soil I mean that wonderful layer of material that nature has left on the surface of our planet in many areas. Soil consists basically of clay, sand and silt. Soils vary around the world, but these are the main constituents in soil.
Peat is sterile and as a growing medium really has nothing to offer. If it dries out it is slow to absorb moisture again. It has been used extensively as a potting medium, but must be chemically enriched with plant nutrients. It is abundant, cheap and light weight. It is often mixed with perlite which is also worthless except for a filler. These things have been useful in starting mixes, but as a main growing medium have nothing to offer.
Sand is ok, but fine sand may be better than coarse. Sand with a little clay mixed in, even better.
Soil needs some fines in it to restrict air pockets. All of the materials you used are quite coarse. You said it is well draining, perhaps too fast draining? Fines hold moisture better and fine clay is more chemically active and provides minerals.
In any case, all of your plants will quickly put roots down into that natural soil your beds are sitting on. (If you didn't put a barrier?) Many plant roots go from 4 to 8 feet deep. Beans not quite so deep. I am thinking your beans are wanting for water. That is why I suggested keeping them well watered. As soon as their roots get down into the soil under the beds you will see them perk up.
If I can make a suggestion to anyone building beds, it would be to excavate ten inches or so of the natural soil, then as you fill your beds mix that with whatever you are using to fill the beds. Avoid peat and use fine sand and compost. Sometimes natural topsoil is available and this would be a good choice for 70% of what you fill raised beds with.
What can be a better growing medium? It is what most of the plants in the world grow in. It is what feeds the inhabitants of the earth. Do you think that we, with our limited experience, can make up something better?
Actually you don't even need soil to grow plants. The school of Hydroponics tells us that. However you do need to supply everything the plant needs in the right proportions. Water, nutrients, and physical stability. All things that soil can do for us very well as long as it is balanced properly.
What is the soil your beds are sitting on? Have you taken a sample in for a soil test? You may be sitting on a gold mine. It looks like it grows weeds very well. Maybe plant a few beans in that soil and see how they do? It is my guess that many gardeners cover up better soil with their beds than they put in the beds.
Give those beans a good deep soaking.
Ok, as I have said before, if you ask ten people you will get ten opinions.
In the end you will work out your own methods. Good luck!