Tren in either ester can have wicked sides, long ester I have always experienced the sides to a lesser degree, but still there. If your hell bent on Tren at this point, go the short ester route and run it for 6 weeks and see how you feel. My personally opinion, at 3 cycles deep you're better off to run masteron in this stack instead of Tren. Again, you can use a short or long ester version. I seen your pics, you already have a lean build. Masteron would serve you well and compliment the test greatly too, and I've always liked a mast/test/EQ stack as well. My advice, swap tren for masteron at this point.
Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.