Are you planning on running 600mg of Tren on top of the 1,200mg of deca or are you replacing the deca with Tren? The only reason I ask is bc 1,200mg of deca is a pretty stout dose and so is 600mg of Tren so I think you will have a lot of side effects if you're planning on running them together. If you're dead set on running them together then I would cut your deca dosage in half and if its tolerable after a week or so then you could increase your dose slowly.
I assume that you're very experienced since you're running a cycle like that and contemplating adding Tren in the mix. Whatever you chose to do, I would like to see pics before and after just to see what a stout cycle like that will do. I also agree with Wonton about dropping the var. Deca and Tren are very androgenic and anabolic and var is very mild in comparison. I just think that var wouldn't do much in this cycle especially since the Deca is probably going to bloat you up pretty significantly.