“This is where individuals must choose which opinions resonate more within themselves. (There are some who will choose one Rav and follow his opinion on every matter. But how does one go about choosing which Rav to follow?…)”
You parenthesize the choosing a Rov and follow his opinion on every matter. But that is the ikur. Perhaps there is an element of choice in choosing a Rov (depending on ones situation), but once that choice is made, it is set. There is no “Rabbi shopping.” One must follow that Rov’s opinion on all matters, and defer ones own, regardless of ones agreement or option on any specific issue.