Ok so I have known some guys to use deca and tren at the same time and like it, but it isn't something I would suggest. I would be more apt to go for EQ. Its a drier compound and gains are not quite as dramatic, but I feel much better on it. First time I ran EQ, I did not like it at 400mg, but since then, I have come to love it. I've run it high, and run it lower. I think that 600mg EW would be a good, higher end of average dose. This is just my suggestion though. I would never claim to know whats best for you and your body. Worst case, you can always drop the tren. Something you have going for you, is your deca dose is low. You might be able to get away with this, and not have issues.
As for GH, nothing is as good as real GH. I have had decent expereinces with CJC/ No DAC 100mcg with GHRP6 300mcg, both taken 2-3x day. Once again, in order to get a good effect, you will want to run these longer term, at least a few months. I would inject between meals to get the best effect and if you are using insulin, I would keep those shots at another time of day. I've seen these GH releasers seem to work best with lower insulin levels