I did some research to find out what could have caused the rhabdomyolysis
and is preventing the CPK levels from going down. While heavy physical exercise is a possible cause, I do not consider it likely as you increased your weight training
gradually. However, I found some reports of rhabdomyolysis in sportspersons/ body builders who had been using phentermine
or only testosterone. I feel these two may have contributed to the muscle break down and it is possible that the continued use of testosterone is preventing a fall in CPK levels. Please bring this to the notice of your doctor so that he can advise you regarding continued use of testosterone.
Hope this helps you. Best wishes.