20 wks is a long time to be doing ED shots of prop. I would most certainly opt for a longer acting form of test. Test E, cyp or Sust. If you want to use a low dose, you can still do so. Personally, I'd want to use more test. 200mg a wk is pretty much just test replacement. 350-500mg would be more ideal. Also, I would lower the dose of dbol to around 25-30mg and possibly run it a little longer, say 6 wks. You'll find that dbol is a strong drug and 50mg is going to be pretty aggressive, especially compared to how you've dosed your test and eq.
At the end, I would run your test one wk longer than your EQ and then start PCT 2 wks after your last shot of test.