Tren is about 3 times more suppressive on your natural testosterone than injected exogenous testosterone, so your PCT can fail if you start too early. The site recommends 30 days waiting period before starting PCT after using Tren E, but you should really wait an extra half life cycle (10 days) after using 300mg/week or I promise your PCT will not work optimally.
You should run an intensive PCT after that cycle. PCT3 and maybe even an extra week or 2 of nolva. Then bloodwork 6 weeks after that.
Either run your Test a bit longer or bridge to PCT with low dose winstrol or anavar.