From the steroid boards we know that T stronger than 200mg/ml can be painful, from diverted pharmaceutical grade to underground lab to home brew.
We also know that underground labs are known to get heavy handed with the benzyl alcohol. 0.9% seems to be a comfortable amount W/V 9mg/ml.
Talk to your compounder about the amount of alcohol they have added and find out if there are any other preservatives.
Injecting to one side of the navel or the other is typical. Do not inject below the level of the navel.
How much are you injecting per shot?