As noted, custom hand fitted grips can be a real asset for high level competition shooters. However in the case of Olympic level shooters we are talking about people with skills that most of us can only dream about gaining. Frankly, for the average weekend handgunner I don't see any real benefit of having some custom fitted grips made. One issue is that there may be a bit of conflict between the person doing the fitting and the person actually shooting with those grips. Another issue is that most of us will gain more by simply shooting more often.
That said, I find the standard Hogue monogrip to be sized more appropriately to a womens hand. Try this test, put your index finger to the trigger with the crease of the first joint aligned with the side of the trigger and your remaining trigger on the grip. Now see if the palm of your hand is in contact with the palm swell on the grip. If it's not, you need a larger grip. One that I can recomend is the 500 Magnum monogrip, it's just a bit wider and the covered backstrap increases the reach to the trigger to eliminate the hand "cupping" too much. Another option is one of Pahchmayr's grips, they were a Police standby during the period when police officers carried revolvers and are very good fitting grips. BTW, the Pachmayr Gripper is my goto grip for square butt grip frames, for the round butt grip frame it's the 500 monogrip. As for fit, I find the 500 monogrip a better fit but the Pachmayr Gripper is a close second. I'll also mention that I've tried the Pachmayr Decelerator but feel the compound used to be a bit too soft for good recoil management.
As for those recomendation for "as high as possible" a grip on the revolver, I take that with a touch of skepticism. With these revolvers that means that the web of your shooting hand will be level with the "knuckle" at the top of the backstrap. To me that is a very natural way to grip these revolvers and I don't see any way of going any higher without running the risk of losing control during recoil. Quite simply it's a bit of a statement of the obvious that likely leads some to think they are doing something wrong when they are not.