I'm 4 weeks into my first cycle as well, and would echo what blshaw just said. I'm running 500mg test E per week, with 40mg dbol a day. Strength gains are through the roof, (although not anywhere near your numbers).
But I can certainly tell that there is now way the connective tissues are groing and getting stronger nearly as fast as the muscle tissue is. So I am focusing on pushing more volume.
4 weeks in and my 5x5 weights are now 10 rep sets. Hopefully at the end of the cycle, this extra volume will convert to retained strength increases due to the increased volume.
Just remember, if you have a perfect cycle planned, and continually overload trying to push your 1RM, eventually you will hit a point where the connective tissues fail. Your cycle will be all for naught if you get injured.
I'm sure you already considered this, but having seen insane strength increases the last few weeks I thought it was worth mentioning. I was pretty scared that I almost tore a pec two weeks ago when I felt sharp pain and twitching during a heavy set at the insertion point. It was an eye opener for me.