Ok, a few questions. I can assume there is no underlying depression as you say they are calm in in-control (although some people have developed unbelievable defense/self preservation mechanisms - NB not the same as denial)
Do they exhibit Cushing's symptoms like puffines, water retention etc?
Has Cushing's Syndrome been excluded?
Iatrogenic Cushing's? i.e. Is the person on chronic cortisone therapy for e.g. asthma or rheumatoid arthritis.
Liver or kidney issues? Thyroid (don't need to tell you anything about that).
Do they get enough sleep, i.e. they're not a stockbroker working 20 hours a day day in and day out.
Otherwise, the person may just have what we perceive as "high" levels but it may be perfect for them. Those levels are a "global" average and some people fall outside those values.
As for the Beta blockers with a "bodybuilding" lifestyle. What is the indication for the Beta blocker. If it is to manage BP and reduce cardiac contractility (afterload) it shouldn't be a problem, just bear in mind that with intense cardio or exercise which raises the HR it may be insufficient leading to a drop in performance.
Bisoprolol and Atenolol are the most commonly used one because old ones like Propanolol have a bevy of side effects. They are quite good in that they allow the heart to "speed" up when required.
But in all aspects where beta blockers are used there are newer drugs in other classes that are superior (imho).
Obviously if you're on a beta blocker Clen is a big no no
Good judgement comes from experience.
Experience comes from bad judgement.