In my experience, the most important factor in comfortable grips on a heavy recoiling revolver is having a decent palmswell that distributes the recoil across the palm of the hand rather than focusing it into the web between the thumb and index finger. My own 4" 629-6 currently wears a set of S&W X-Frame grips which not only have the aforementioned palmswell, but also a gel insert over the backstrap to further cushion recoil. Unfortunately, the X-Frame grips are only available for round-butt revolvers and thus wouldn't work on you M29. My Father's 4" 29-2 has a square butt and he's found a set of Hogue hardwood grips with finger grooves and no checkering to work well for him. Another option, if you want a more classic look and don't mind dropping a bit of coin on your grips, is the target stocks made by Culina Grips have the more pronounced palmswell of the classic "Coke Bottle" Target Stocks which S&W used to make in the 1950's. I have two sets of Culina grips and they are the highest quality and best fitting handgun grips I've ever owned (and are also available in a variety of exotic woods if that suits you).
While not a .44 Magnum, I replaced the factory target stocks on a 8 3/8" M57 no-dash I used to own with a set of Culina's "magnum profile" Coke Profile Targets. This made the gun much more pleasant to shoot and retained the classic look I wanted to keep. I also have a 5" M27-2 which wears a set of their standard Coke Profile Targets which is quite nice to shoot. While both profiles have the "football cut" I've found that the standard Cokes on my M27 still have enough clearance to allow the use of HKS speed loaders while the "magnum profile" ones do not as they are noticeably thicker.
Culina also makes the finger-groove "combat" style of grip for square-butt S&W's, but I cannot comment on their feel or recoil management as I've not personally owned or handled a gun equipped with them.
https://www.culinagrips.com/
Edited to add: I no longer see an option for the "magnum profile" Targets on Culina's website, but as these grips are custom made to order it's highly likely that a set could be made if that's what you wanted.