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Originally Posted by
Slacker78
If you're very sure having followed all the perfect injections practices, i could think that gear in time was contaminated and when you inject higher amount of it, the reaction getting more intense ( this could explain that a 150mg/week you hadn't no issues but at 400mg/week, you did ). On the other side, i could think that test-c amount in a single shot, maybe is too much for your absorption capacity of that specific injection site. You could try to split the whole dosage in 2 shots in different days and verify your body reactions.
I don't think is related to EQ presence or absence.
Further, it would be interesting to change gear or getting a new test-c vial, and experiment what happen.