yea the hdrol doesn't really kick until minimum 4th week, I would use the epi to kind of kickstart the halo, just run your epi at 40 all the way through start the halo on the second week of epi and I would possibly cut the first two weeks of halo to 50mg if it would give you an extra 2 weeks on that (total 6 weeks on hdrol) even though its usually sweet spot at 75mg it might bring more out of it.. I would almost save one for a different cycle though, anyway you can get another ph with halo+another ph as well as maybe an epi/stack ph? they both kind of act the same but if your set on those two and you run as I said or similar I think you will get something out of them.. even 5 weeks on halo would be better, I ran 8 weeks I believe didn't notice anything accept the 5th/6th week I believe it started to kick and I was running it at 100mg.. hope I kind of helped I just confused myself in the process and I am in no way a know it all but I am trying to help a bro out!