I would guess you're doing the wrong gear...
I did a similar cycle 4 years ago and will never again combine those three compounds. I was on test prop @ 700mg/wk, tren ace @ 525mg/wk and winny @ 350mg/wk. I made great strength gains and hardened up like nothing before. My speed also went through the roof during the first 3 weeks. Despite intense habitual stretching and warm-up routines I managed to tear a hamstring in week 4, then a pec in week 5 and by the end of the cycle...my other hamstring.
I've since run test/tren together 4 times with no muscle tears, although I do notice that tren causes my hips, especially hip flexors, to be very tight all the time. Dropping the winny did the trick for me, but I can see where tren could pose a problem as well.
As far as recommendations for other gear, others may have good suggestions, but my experience is limited to these three compounds.