I wouldn't go higher. Depending on the lab, 300 mcg/dL is around average for young men. My thinking is that in the absence of better information about any hormone it's safest to target mid-range for guys at their peak. The idea is that evolution has selected the best balance of levels for overall success.
217 is within the range here tb, but then maybe it should be little higher? Agté bought the DHEA a long time ago, but I did not use it for doubts. It seems to me that it has good effects on women, for aumentra T, while in men much caution