i can tell you from personal experience that test susp will leave test levels elevated for much longer than the short half life listed on internet web sites. once, i went in for blood work at the end of a cycle to check organ function. i had been using suspention only for 4 wks at 100mg ED. i had discontinued all injections around 4 or 5 days before i went in for the draw. my test levels came back above the upper readable limit. if they are going to check your test or test to epi test, you'll get popped. 

the way i've understood many athletes to use AAS is in a 3 steps forward, 2 steps back fashion. get the most out of it in the pre season, improving your ability to preform and then come off before you compete. the mind set is that you may not maintain all of the added preformance you had gained on gear, but you will still be ahead of where you were had you not used.