George:
The funnel effect on #17 never seems to help me very much! However, with the exception of the front left, #17 green does have slopes on either side that will direct a ball to the center of the green. With a center or center-back hole location (as during the Sat-Sun-Mon rounds), this does help get the ball to the hole. When they had the hole in the front left, there were some circus putts from behind the hole, though. The right side of that green has tremendous slope to it, so any putt involving the right side is a real treat...
The key to #17 is getting the tee shot enough to the right side of the fairway to open up the hole. It is not a hard downwind tee shot, but I spend a lot of time blocked out by trees left.
#18 was played from the typical member tees at 498-505 yds. (The black tee is another 25-40 yds back) I have always suspected that the measurement of that hole is on a direct line over the ESA (like a laser sight) or that the yardage markers are a little off, as I have hit drives I know go 230-240 yds, and still had the markers tell me I'm 290-300 yards to the hole. It is a 175-180 aerial carry to clear the first ESA, and about 290-310 (depending on the angle) to the end of the fairway. To get to the best spot on the low left of the fairway, the tee shot has to have a slight draw, or be hit on a line directly there, to take advantage of the right-left cant of the fairway. As I know all too well, tee shots with a "slight" cut will deaden against that slope, or get pushed by the prevailing wind toward the bunkers and grass on the right.
For me, it is a maddening, frustrating hole that I haven't learned to play well. I have seen everything there, from an eagle 3 to mid-teens--that part of it is fun, though, as no score is ever safe on that darn hole!