Heh. No, man, you are certainly not blabbing. That's good stuff about your diet. I always like to read what other people do to succeed at something and you certainly have succeeded at achieving fantastic conditioning. You are probably leaner than anyone on this forum presently with a good build to show for it and it clearly does not all come from genetics. Thanks for sharing.
As for a tren only cycle. No, it certainly will not be a waste, and I would be surprised if you ended up where you started after a proper pct as you clearly take care of yourself year round so you will probably be happy with what you end up with. Provided you do something to keep estrogen from dropping too low.
If you are just dead set on not using test, I cannot understand why, but, as was mentioned above, at least run some HCG concurrently, as you are also going to be pretty suppressed and this will both help to keep your estrogen level up (I can't say how much or if it will be enough, someone else who knows better than I will have to weigh in) and will keep your testicles functioning well so that recovery will be easier post cycle (tren is highly suppressive). I can tell you from personal experience that when your estrogen drops too low it is pretty miserable and it does not just bounce back (sometimes for months).
I will say, one more time, that I think you are wasting some terrific synergy in not using test and tren together. Even a low dose of test, say, enough to replace your natural level (which will quickly disappear and have to be made up for by the tren in a tren only cycle) is going to make a pretty big positive difference. And if it happens to be the test sides you are worried about, I think you should read H-train's post elsewhere on this forum, as it is perfectly suited to answer those worries.
Either way, good luck.