Hi Bill;
Thanks for your questions. This is actually a pretty common dilemma for both people returning after a long break and those just getting started in climbing.
Focus on just climbing and let the fitness return from the actual time spent moving while climbing and the approach/descent time. That’ll get you a bit of a base of general fitness will you re-hone those movement skills. Later you’ll be better positioned to assess what is holding you back from performing better.
Bouldering I track TSS like strength training (which TSS is not designed for). Assess your fatigue from a session. Chances are a hard bouldering session will be like max strength and leave you tired for 2-3 days. Then 80TSS/hr is in the ball park. Similarly, for sport routes that feel hard. Easy climbing I track more like aerobic work.
Welcome back to climbing.
Scott