Once you take a shot of gear, you are shutting down your natural production. 1 shot of deca is all it takes to effect your natural production. Tapering down isn't going to help you recover. Coming off all together will. Also, I promise you, your lab work isn't going to be normal after running gear for 10 wks. It will take a couple of months. At 4 cycles in, I'm not a fan of effectively staying on for a 20 wk cycle, using doses that are all over the place. Why not split the difference and something like a 14 wk cycle, running the same doses through, and then do a solid PCT at the end?
1-14
test e 400 to 500mg
adex as needed
HCG 250iu 2x wk
1-12
deca 400mg
PCT starts 2 wks after last shot of test. Deca has a longer half life, so you are better off stopping the deca a little earlier or you would have to wait longer to start PCT
As for accutane, I would suggest going to the DR, as it is a very harsh drug that can effect a lot in your body. If you decide to do it on your own, I would start with 20mg ED and see how that goes, possibly going to 30mg, and continue for a few months. Make sure to get your liver values checked.