I'm a contractor and have tried many ways and things and this is what I have found works and doesn't for me:
If you are using ONLY a rake I would agree that running at 45 degree angles and then in overlapping circles is the way to go. Angling the rake fully one way and driving in one direction (say, to the right) will have a totally different "cutting" action (versus just dragging) than going to the left--depends on soil, soil conditions, forward speed, etc. For instance, going slow allows the rake to follow the contours too easily. On the other hand, high gear will cause the rake to stay relatively at a certain level and literally blast through the high spot. Using a piece of fence is the final touch too. I use a an 8x10 piece with a sheet of plywood loaded with 300lbs of steel placed and strapped down mid way. The effect is that of a "cheese grater"--any high spots will grated off with a few passes. I have a lot of this fence. It is basically trashed after one use--get it hung up on a underground object and it's toast. Keeping in mind the fencing is "disposable", I hook up the 6' box scraper and drop the center ripper tooth all the way. All I do then is back up to the fence, lower the box and catch a few fence wires with the tooth and the way I go. Now I can change the angle-of-attack of the "grater" by using the 3pt.
Another trick I use is tilting the box scraper (via the top link--see notation below about my custom hydraulic top link) so that the backside blade is about an inch higher than the front one. Then I drive in reverse (the TC33D's got cruuuuuuuise control so it makes it easy) and the weight of the box scraper does the work. If a spot is too high simply drive forward scalping the spot then back over it. Then, again, use the fencing for final.
What's even better than those is a power box rake. I bought one and can't believe what a difference it makes. It's about 10 times quicker and better than a rake or a scraper. (Before buying the power rake I bought a Gill Super Pulverizer (twin roller). It's nice but is only 3 times as quick. It's for sale for $800 in Monroe, MI
Hydraulic top link: Is an infinitely adjustable top link. Basically it is a 8" stroke hydraulic cylinder that has 3-pt ball sockets welded to each end cut from a new threaded top link. A ball-style valve is plumbed between the top and bottom ports and filled with hydraulic oil (has to be bled of all air otherwise it will act like a shock absorber). All you do is open the valve "circuit", pull the piston rod (if not connected to an implement yet) and turn the ball valve handle. Now the fluid cannot flow from one end to the other and is effectively locked. Be sure to keep the piston rod and cylinder COOOOOL during welding or it will melt the seals (Doh!!!!!)