Raw (unmalted) wheat is used in a Belgian Wit but I don't think it is to add body.
What makes you think raw wheat will add body?
Is it a German wheat beer or a Belgian or some other type of wheat beer you are planning to make?
You should have very little headspace in your fermenter to help minimise oxidation.
Cider does not throw a large krausen.
Besides apple juice starts oxidising as soon as you crush the apples.
If you want to use Dark Candi Syrup you are best off buying the real thing.
It has much more complexity and flavour than any you may to try to make yourself.
Best to know your original gravity and then check your gravity again a few days into fermentation and depending on the reading a few days after that.
Hydrometer reading are how you tell when your fermentation is finished not the number of days it has been fermenting.
What type of system is this,
Multiple vessels , Hot Liquor Tun, Mash Tun and kettle
or
Single vessel system.
What volume are the vessels/vessel and what sized element for heating?