By the way mates, here is an update on the 400mg/ml Test C (no BB):
1. It crystallized after 1 day after it was first brewed.
2. Then, it was reheated back into solution.
3. It has been 2 days now, and there is no signs of crystallization as before.
So, it seems possible to brew 400mg/ml of Test C without BB. But at this high concentration, the hormone crashed 1 day after injection, and there was a small, temporary lump at the injection spot.
Therefore, if anyone is considering 400mg/ml of Test C, I think that you either need to heat/massage the injection spot, or you need to add a small amount of BB to avoid the post-injection lump.