I'm a little confused...what type of brewing are you doing (AG, partial mash, extract with grains, BIAB)? Eight pounds of grain seems like an awful lot for anything but AG, but then you have another 6 pounds of fermentables you're adding with the sugar and the LME. I'm also confused by "Cook Grains @ 160 for 45 Min"; that's too high of a mash temp unless you didn't want fermentable sugars.
Regarding an active secondary, I do a watermelon wheat
based on 21A's and it's normal to have it take off in secondary again after adding the fruit.