This Kimbo thing is just another excuse for the media to label steroids as a possible cause... which it could be... but it could also be every other legal drug under the sun aswell as personal health issues which never get a mention...
Anyway, I am sure the more research you do and documentaries/Youtube videos regarding steroids and their effect on the body you will soon come to your own conclusion on how they can be used safely for a lifetime... And how even steroid abuse must be pretty fucking heavy to cause any real issues.
Mild test based blasts over your TRT dose is going to do nothing other than reap you rewards and a better quality of life.
Just eat clean and generally live in a healthy manor and there is no reason to really expect any health issues.
If you start to head in heavier compounds like Tren or hepatoxic orals like Dianabol, then you need to be more responsible with them and take plenty of time off between... still staying on the TRT doses of course.