Interesting question. Heres the first thing I'm thinking. It has been awhile since you used Dbol last. I think it's very possible that your body is having a differet, and not so positive response, which in my book is really too bad. I too find Dbol to be an "old favorite". Thankfully for me, Dbol has been one that still works just fine, although I do need to use a lower dose now than when I was younger. On the other hand, drol is one I can no longer handle. I used to be just fine, in fact, super human, on a dose of 100mg ED. Now, on 50mg, a decade later, I feel sick and my appetite goes away completely. I have seen that as we age, orals seem to take a rougher toll on the body. I've seen the lab reports on GP reports showing it to be right around 10mg per tab and in my personal experience, I'd say it feels about right to me. I have used probably about 10 different batches since they came out of 2008 or 2009. It's always been 100% for me. In genreal what works for me now is differnt than what worked for me 10 years ago. My goals have changed but so has my response. If you're finding these negative effects, move along to something that does work for you. As far as orals go, I suggest not going too heavy with them anyway. They are great for short periods, but even to kick start a cycle, you can do all sorts of cool things with the fast acting injects. I like to kick a cycle off with a few wks of dbol, for sure, but starting with NPP for the first 6-8 wks can do some pretty cool stuff and even play a role in the cycle for longer than an oral kick start can. Sust/NPP/EQ is one of my go-to muscle building plans.
As for the pain from the Sust270, sorry to hear that. I think that for some guys, they have a rougher time than others with certain products. Sust270 is my favorite test that GP makes. Sounds like you're doing the right stuff, mixing it with other, less painful gear. You could try heating it a little. I use a hair drier to do this and warm the barrel before injecting. It lowers the viscosity of the oil and goes more easily into the muscle with less pain. This could potentially help.