The grunt down low comes from dynamic cylinder pressure. The earlier intake close and or fast ramp and high lift cams help accomplish that. Other later close cams can be crutched with added compression to act like this at lower speed although their true sweet spot is higher. There are trade offs and we can always pull the junk out to prove a point. Drop the bomb and then move on. But what is missing is more data. If valve seat life is shortened, how much? Is this a trade-off I am willing to make? So there are logical ways to choose a cam that suits the need. If noise is the focus, the most quiet I have installed are Wild Things cams as a whole, all of them. Andrews, S&S, SE most grinds are not noisy typically. That said the ones that get called on the carpet for noise the most, Woods, vary grind to grind, not all of them are that bad. In my experience as I stated before with stock valve springs, beehives, the TW5-6 runs quiet. I do shim the springs for a little added pressure but they have been used without that. I have a few of these here on daily riden motorcycles and they have in excess of 10k miles no issues yet. As always I respect Johns opinion but we haven't seen any problems as of yet. Time will tell. By the way the TW5-6 is a cam routinely used by our main performance dealer in the northwest, Latus Harley Davidson, for many of their late model builds and they do use stock springs in some cases depending on the head package used.
Side note, I am not a Woods troll. I would and do use and sell many other grinds. I also recommend many I don't sell. This one just fits the bill in this case.
Back to the original post the CR575, looks very similar and would likely perform well in the 103" LTD, but I have no experience with those. I don't know about the ramps or valve spring requirements