Basicly science says that in order to stimulate muscle growth you need to cause rapture in the muscle fibres, aka Micro Trauma(MT). If you lift 200 pounds in bench on your last workout with gear, you can not goto the gym during the following week at PCT lifting 180 pounds and expecting a benefit. 180 pounds is not enough to break through the protective fibrine layer surrounding the musclefibres, and therefore it will not cause micro trauma. You have to lift example 205 pounds in order to make that happen. So I am basicly saying that if you cant lift MORE, you need to stay out of the gym until fibrine layers are broken down. At wich point, you can bench 100 pounds, cause maximum Microtrauma and reap the benefits. 10 days to 2 week out of the gym will not make you lose muscles, it will remove the fibrine layer, your muscles will lose its pump and you will get a bit softer and feeling weaker, however, you recover quickly.
The main problem people do in the gym is that they ignore light weights and go directly to heavy weights and lift until failure. First of all, FAILURE as we know it is not muscle exhaustion to the point of not being able to lift no more, it is simply the nerves overloaded with electrical impulses telling your muscles to contract. At failure your nerves can no longer give the required signals. The fact that you feel completely broken down 2 days after the workout is not your muscles aching, but your nerves equal to burned out elcables, being repaired.
In theory our muscles are made to be used every day. It would suck for the stoneage people to only be able to go hunting once a week due to workoutpain etc. So when people goto the gym and lift 200 pounds until failure, you have 48 hours of growth factors active from the workout, however, if you do not workout the same muscles again after 48 hours the growth stops, until the next time you work out the muscles and cause microtrauma. However, if you lift 200 pounds again when you goto the gym, you will not cause microtrauma, but you will exhaust your nerves. If you work by a 10 week program and stay on the same heavy weights the entire time, your growth will be extremely slow, even with gear.
In order to create the greatest growth environment you should make sure that you lift 5% more weight on each excercise every workout. By reducing sets and spreading them throughout the week, you will cause micro trauma each workout, and you will hit the gym before the 48 hour window is exceeded and constantly keep growth factors activated. If you train your chest and tris once a week til failure, you will have 48 hours of growth factors, no matter how hard you train, the 5 following days.. nothing. If you however train your chest and tris 3 times a week, every other day, increase the weight by 5% each workout, you will have 7 days a week of growth factors, meaning that you will grow every day of the week, not just 2 days every week on each section. This is the reason why I have had incredible gains working out mostly natural for close to 20 years now.
When I can no longer increase the weightload, I take a break from the gym, resetting the fibrine layer so I can benefit from light weights and increase the load every workout for 8-10 weeks. Since the steroid cycles I like are lasting 8-10 weeks, it fits my workout program perfectly, so i get my rest period on the first 2 weeks of PCT. You still need to eat well. On week 3 of PCT I hit the gym again, now I am down to lifting donal duck weights, 40% of 1RM in every excercise and I increase the load by 5% every workout thereafter.
I strongly suggest you read up on the HST-theories, if you have yet not tried it, I think it will really change the world of BB for you forever. HST is not unique, most programs are based on hypertrophic ideas, the thing is that the program tells you to do something, but it does not explain why. HST is based around science and research, putting all the knowledge and results down as a basis to explain how the body works, allowing you to manipulate your body to the maximum of musclegrowth benefits. Starts out with high volume reps and as weights get heavier, reduction in reps every other week, until you reach the last 14 days of your workout where you do negative lifts.