Upping the hydration (Reinhart's WW Sandwich Loaf)

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I am trying to increase hydration on Reinhart's WW Sandwich Loaf recipe. Am I correct that I do this when adjusting the final dough, or should I add more water to the biga or the soaker? 

Does anyone have a source to see good pictures of what 75% hydration dough should look like? (Preferably pictures of several different hydrations) and videos of how to knead it, even if it is just for the three-four minutes Reinhart recommends? (I see one in the video section on this site, and wonder if there are other methods)

Blessings!

Voni

Http://camiabreadlab.blogspot.it hi this is my blog you will find also an instagram link with a lot of stuff on high hydration. I wrote a book also called natural leavenings out soon