soft whole wheat loaf

I have tried whole wheat bread with raisin yeast water for a while. When I made a levain with 100% whole wheat flour / 100% raisin yeast water, the loaf came out quite sour.   My family disliked the loaf sadly..    Then I used dry yeast for poolish and final dough method with raisin yeast water, it came out quite good.

 But, I felt something was missing in the crumb.