I get that the majority of shooters either don't know or don't have access to the resources needed to learn how to work on their own equipment and what each change does to the system; but I feel that one of the best ways to grow the sport on a whole is to get the information out there so as people question things. If people just accept that factory spec is law there will never be the feedback needed to drive the market in a different direction.
I learned how to work on this stuff by trial and error... kinda a "lets see what happens if I do this". I talked to people about why they did what they did, asked questions about specific items; not just a setup on a whole. For the most part all archers are very approachable, even those that shoot pro class. Talk to people, see what jives across the group and see what differs.
On the topic of strings tho; thats one of the biggest factors in getting a solid setup that you can trust. If you don't have good strings you're gonna fight things. What I do when setting up a new rig is use the factory strings as a sacrificial set to get the final harness lengths so I can have a set built that puts the bow at the spec I want it at. So I'll twist things up, let things out, mess with cam rotation, etc to get a platform that I'm happy with. If i'm a 30.3125" DL, I'll put 10-12 twists into the cables, let the string out a touch, take a turn outta the limb bolts and see how that feels... if its not right I keep messing with things until I'm happy. Then I take that harness set and measure those to have new strings built; I feel a lot of people mess up here and that they just order strings to factory lengths and factory spec. I run 452x natural, higher strand count, and different serving dia than stock strings to get the feel and longevity out of a set of strings-- so going from a 24/28 strand set to a 28/32 strand set will change holding weight, feel at full draw, and wall. A 30/30 set feels different as well. A set made out of 8190 or X gives a different feedback and takes a different strand count to get the same feel.... I also run non stock serving lengths as well.
Everyone approaches things differently but at the end of the day we all want the same results.