I do the 1/2 way, tuck, about 6 inches tuck, and all the way down method as well. One thing you may try if it isn't closing all the way easily, is on the tuck at the 1/2 way point, get the canvas as far towards the middle of the Pup as possible so it isn't bunched up along the sides as much. You may need to make another stop at about 12 inches and do a tuck as far to the middle as possible also.
I do have to let the top "settle" a little because of the memory foam topper as well, but after a minute or two with no tension on the lift mechanism, it latches easily. We can go from completely set up/hooked up to ready to roll in about 10 minutes if I'm really hurrying (read starting to rain). Normal speed is about 20 minutes from start to finish.