Usually, there is no need to use an uncapped test, since you can already see with the capped one if the gear is real, or not. However, if you are having PIP on every single injection with the enanthate, then there is definitely something wrong with your gear. You may get some PIP from time to time, but not every single time, and when this happens, it is a clear indicator that there is something wrong with the gear, and you should rather switch the brand.