Welcome to Shooters Forum, Booshway. Sounds like you've been down the river a time or two.
I don't agree that free floating or glass bedding are a "must", but I do think the most important aspects of accurate cartridges are careful, consistent case prep and concentricity in your bullet, neck, chamber and bore. Once you've made sure those details are tended to the only thing left is to use one method or another for load development.
Have you ever used the OCW method?
Optimal Charge Weight makes sense. Each rifle may have different scatter nodes. Depending on the barrels harmonics and bedding interuption, just another reason to free float and glass bed. Sounds like he is having a flyer occurence. That can be very aggravating and is usually an indicator of a problem. The good ole challenge and process of elimination begins. Not all of the OCW's proove accurate, above the scatter node seems to be the ideal window of accuracy for a step in the right direction. Find that point, then seating depth can play a major role.
I'm not saying you can't get rifles to shoot excellent without free floating and glass bedding, but more often than not, it is a main ingredient for superb accuracy. Once you have done it, you won't be thinking about that as a potential problem causing your flyers. I think all the comments on this post have validity. All good rifles can shoot well and have their own hidden idiosyncrasies, it's up to us to hunt them down!