Mark, what you are seeing that looks like vetch is actually some volunteer partridge pea that just popped up out of the seed bank. There really isn't much of it. I think the trick to getting everything growing together is getting the right amounts of seed mixed together so that the most aggressive plants don't choke out the others.
This plot contains several species, and some of them are not commonly mixed together. I mixed a light dusting of a few warm season species in with my cool season species just to do some experimenting, and it has worked out well. The warm season species have been eaten hard, almost acting as a nurse crop for the others. Look at that close up pic of the food plot and zoom in a little on the top left corner. Those stems that have been bit off are from young sunhemp. The deer have gone through the plot and cherry picked off nearly every plant of it.
Below is what I planted, and I just guessed at the pounds per acre. Ironically, I got the radishes just a little too thick, but that ended up being good, because the drought has kept my perennial clovers from germinating. The only clover that has germinated has been the Crimson Clover. We got one good rain right after planting and it has been something like 37 days since another rain. We were supposed to get some last night and today. I hope it comes.
Diakon Radish
Crimson clover
Medium Red Clover
White clover
Crimson Clover
Chicory
Oats
Wheat
A light dusting of buckwheat
A light dusting of sunhemp
This was a throw and mow plot with no tilling. I killed the existing vegetation with Gly, scattered my seed, cultipacked with a pickup truck, and mowed the thatch with a Grasshopper lawn mower.
In the pictures above you are seeing the best areas of the plot - low ground where the moisture is better and also a little shade. The bad areas aren't horrible, but don't look quite that good - mainly because the clover never got the chance to germinate. Hopefully, it still can if we do get some rain.
PS: Here is a closeup of what happened to nearly all of the sunhemp: