I agree w/Mad Mat re: using Royalex versus Kevlar on Chase Rapids.  In fact, I strongly recommend your using the available service to portage your belongings at the other end of that 9 mile stretch.  I nearly lost my in-laws & my wife in there... and one canoe came out looking worse than DD's car looks like right about now (after its tangle with a big buck).

We took far more white fish than trout.  Spinners & small spoons seemed to do the trick pretty well with them.  My campsite info would be somewhat dated (ie. my trip was literally 30 years ago); my recollection is that finding sites was never a problem back then.

Its a great trip, about half rivers & half lakes.  Mt. Katahdin will be quite visible for most of the first half.  Excellent scenery.

Jimbo  8-)