I brewed this recipe myself a while ago, and was pretty happy with it.
First, soak the chip longer than overnight - IME it takes a couple weeks for the chips to absorb flavors.
The next is to be a bit light when it come to adding the chips to the beer. Mine came out pretty oaky - in fact too much so.
I don't remember how long I left them in, but when you have them in, taste every couple days until you get the effect you want, then get it off the wood as soon as you can.