Got my first case of tren cough tonight. ..not cool!! Lol
Ya man, that shit sux.
What I have found to help avoid it or make it so the cough is not so harsh is to take the Test you are running and divide it by the number of Tren injects you are taking per week and mix the two for every inject.
Also, make sure they are mixed together and not separated. Usually, the Tren will sit at the top or the bottom of the syringe depending on what way it is facing. Just make sure it's a solid color instead of dark at one end.
That will dilute the Tren
Of course there are no guarantees but IMO, it's your best bet and it's what works for me.
HDH