Only one way to find out I guess, give'r a go. I would think the sides you don't like from the tren will be multiplied when adding in the decca, but should subside once the tren is taken out. I would up the test to 500mg throughout, 280 isn't that much, you will probably get better results with a baseline of 500mg. I am on 200mg deca a week with no noticeable sides, I added this into my cruise of 150mg test e weekly.