I stop my Deca, then go on to Tren/EQ.
According to Pheedno, it's mainly a Prolactin issue being the main reason for not running the Deca and Tren together....at least I think that's what he said???
Everybody else seems to think it's the shut down that is the problem with that combo...personally I've never ran the two together, however back in the day I did run Parabolan with Deca Frequently with no Problems that I can remember....of coarse I'm freakin' burned out.