When I first bought mine and found out about it's personality, it was a youtube video that helped me make sense of it all. I wish I still had the link to give but that is long gone. Once I realized it was all about making the hammer, hammer strut, and main spring come together....everything finally clicked. With the hammer sitting in the right position, the hammer strut gets placed into the 'cup' (for lack of a better way of saying it) at the top of the main spring (part of the mainspring housing). When the hammer strut sits on the spring properly, you should feel a small amount of tension as the mainspring housing is re-inserted into the grip. If there is no tension felt, the hammer strut isn't positioned correctly.
Ruger might have over-engineered the Marks, but That's ok. I love mine. Every firearm has it's own unique character and charm. Like people.
You shouldn't worry about 'looseness'. That should be looked at more like 'break-in'.