As a rule of thumb, ... I like to go into a cycle as strong as possible (try to max out as much as I can), then I up the reps and overall volume a little, while on, then go back to strength type training when off. I find that this works best for me.
I think that where you should really be focusing your efforts on are PCT and proper nutrition. I dont believe its solely on your training regimine whether you keep your gains or not. I think that a restored HPTA and calorie surplus will help you keep them more. I always keep my protien high after a cycle, sometimes increase it. Proper PCT drugs are important to get your natty test production back as QUICK as possible. Even with the best training regimine, if you are shut down you are going to loose gains. Hitting your nutsack with LH from HCG is important imo to rapidly restore your nut mass, and fire them up agian. Of course diet is key too. Creatine and glutamine can help here.
I guess they all play somewhat of a role. For postcycle I would rank the 3 in this order of importance.
1. HPTA Restoration
2. Diet
3. Training
I am going to take wk off this time around, eat big in this week, then change my training to strength type training and start the week after. GOing to see how this works. The more that i think of it, I do think that its a good time to give the body a break. Think of it if you were working big overtime hrs every day for 12 wks straight. You could probably use a quick re-coup break.