Man, you just described my entire first season of tri training. I did the exact same thing, treating the bike like it was its own race and then wondering why my legs felt like wet cement for the run. Nobody told me the whole point is to teach your body to run on tired legs, not to crush every ride like it's race day. I kept staring at my bike speed going up while my run pace fell apart, and it took watching a guy twice my age pass me on the run to finally get it. Once I dropped the ego and settled into a steady effort on the bike, the run stopped feeling like survival mode. Eight weeks is a rough lesson but at least it stuck, that's what matters. Did your coach give you any specific heart rate or power zone to hold on the bike after that?

A broker isn't a bank though, so that's a bit apples to oranges lol.