Tomato Soup

This recipe comes from Mennonite Girls Can Cook and I made a few small (I thought insignificant) changes but this just ended up bland for me...

Soup Ingredients:
2 Tbsp oil
1 onion, chopped very fine
1/2 green pepper, chopped fine
1/2 cup celery, chopped fine
1 tsp basil
1 tsp dill weed
28 oz canned whole tomatoes
2 Tbsp tomato paste
1 Tbsp sugar
1 tsp salt
pepper, to taste
2 cups chicken stock (1 Knorr chicken bouillon cube + 2 cups water)

White Sauce:
¼ cup butter
¼ cup flour
2 cups milk

Blend tomatoes in blender until just blended. (Do not substitute whole tomatoes for pre-blended) Heat first 6 ingredients in large pot until onion softens. Add tomatoes, tomato paste, sugar, salt and pepper; simmer 10 minutes. Add chicken stock; simmer 20 min.
In a small pot, melt butter, using whisk, blend in flour and milk to make a white sauce. Stir sauce into tomato soup. Serves 4 – 6

Notes:

I didn't have a green pepper so I used a whole red one.

I think I did about 3 cups of stock, so I increased the basil and dill to 2 tsp each.

I didn't use canned tomatoes or tomato paste. I blanched a whack of tomatoes (Roma maybe?) threw them in the pot. Maybe this is where I went wrong... too much juice from the tomatoes and I diluted the rest of it???

I did one fairly small onion, I could have done a large one for the amount of soup I have. 

I didn't do the final steps with the white sauce because there's no point in continuing if the first part isn't tasty. I'll work on what I have and then do the final step.