The poundages you move and your thirst for knowledge are equally impressive my young friend.

1) While on AAS it is possible to train each body part 2x per week if you feel up to it. This is a matter of personal preference but while on AAS, your recovery time is drastically reduced. Your rest time between sets is also dratically reduced.

2) IMO changing your routine every 3-6 months is extremely beneficial in increasing overall strength and muscular developement. Our bodies adapt to the stress we put on them and after a period of time the reaction to those stresses is less and less. By varying the exercises, reps and intensity of your training you keep the body constantly adapting and growing. It also allows you to train and strengthen other stabilizing muscles that will in turn improve your overall strength (ex. substitute flat bench dumbells for bench press). Check your ego at the door because it will take a while to get used to the new movements.

Pete