As far as whether the bunks should be angled in going forward, the answer is, No. The table indicates a spacing that keeps the bunks under the stringers and they are parallel.
One thing to keep in mind when having the lift installer adjust the cross beams. On the Gradys I have become familiar with, the bilge will hold considerable water up forward if the boat is situated so the cockpit sole is fairly level. Unknowing people will adjust the cross-beams to hold the boat in an attitude that makes it nice to sit in the cockpit in deck chairs and have a drink and such. The boat looks nice in that attitude but it is very bad for fuel tank corrosion and mold below deck. Watch your installer and make sure he puts a long carpenters level or an inclinometer on the keel and gives you at least 2 or 3 degrees of keel slope aft. that way you can drain your hull completely while on the lift either by removing the drain plug or vacuuming from above at the transom.