Dude I wouldn't worry about it....chances that your fina is fake or underdosed is slim. Best thing you can do is make it yourself, because there aint now way the pellets are underdosed, or they'd be sued for false advertising.
also, not everyone gets the taste in the mouth, and very few get the cough.
What week are you in now? 4? 5? you should be experiencing more mass gains by now and incredible stength gains, assuming your diet and training are in order.