I've seen them stacked and Hyde is stacking them now. But honestly it seems to big of a risk for your organs at 2 methyl compounds.
Stick to 1, full dose if, don't be a wimp, eat, train and sleep because you will be tired.
Here's my .02; there's a ton of misinformation on here (even in this thread) so I can't expect you to believe everything I say, but this way you can get another opinion: Epi needs at least 40mg for me, halo at least 75mg, they both take a good 3wks to really see some positive changes, so you'd definitely want a 6wk run. Both compounds have good synergy with one another, as well as Trenavar (Trendione, aka pro-trenbolone), so stacking them together or one with Tvar are great options.
To each is there own but this is a waste of time if you wanna cycle....
Agreed if you're addressing length - 4wks of either compound is not a long time to really reap the benefits.
I'll stick to my suggestion of 6 weeks hdrol/stano
This would be a great cycle; you probably couldn't go wrong here - Epi, Hdrol, Tvar all are going to shut you down. Running any of them solo or in some combination are going to have you fairly suppressed to the extent that you really feel it within a few wks. Going 6 good wks, you're going to be spending probably at least 3 feeling awful - Stano will help fight lethargy, help libido, increase vascularity & endurance. Don't bother with less than 600mg/day, & up to 1g is very reasonable/day (I'd start with 600, personally, & taper up as wks progress).
I don't think stacking two methyls is the problem, sdmz is a two methyl stack and is great. It's just you're stacking two similar methyls at low dose rather than running one at a useful dose.
This kind of really hits the nail of the issue on the head: Stacking 2 methyls isn't any more unsafe than big doses of a single - what's more toxic, epi @ 30mg w/ halo @ 50mg, or Sdrol @ 30mg? Easy answer: Sdrol @ 30 - why? Because nobody can tolerate running Sdrol @ 30 for 6wks lol
But, as Mystere3 points out, you need to run high enough doses of the drugs to make them work. If you get your wisdom teeth pulled, are you gonna take 200mg of ibuprofen & a single cap of tylenol? No, you're gonna take at least 800mg hits of ibuprofen & still be wishing your a-hole dentist had given you a longer script for the Vicodin.
You need to understand the compounds you're using & efficacious dosing of them - for me, Epi minimum is 40mg & Halo 75mg. You could totally do this, but, as suggested, perhaps one solo at a slightly bigger dose or with Tvar would be the healthier option with identical gains. Epi & Tvar pair better, as Epi is a DHT derivative and acts as an Anti-Estrogen, kind of the way Masteron does. Stano helps this way as well. Tren will elevate your prolactin levels as it binds to the progesterone receptor some, but it's tough to get gyno from it if you keep estro down none-the-less. If you use the Tren, be using exemestane on cycle & keep some prami on hand at least.
I'd run Stano (600-1kmg) with Epi or Halo, 40-60mg & 75-125mg respectively (starting at the bottom number if you've never used it before). If you want more, Tvar @ 60-90mg starting up to - sky's the limit; ppl vary wildly how much Tren they can tolerate. You should incorporate either prolactin control like caber or prami, or an AI like exemestane, or both if you go this route. Find your sweetspot but DON'T overdo it. Live to cycle another day.