I probably won't be much help, but I did use dual-coil clear XL cartomizers on a standard Riva battery, which is comparable to an eGo battery. I also used the dual-coil on my REO. The vapor production was the same, but the eGo battery only lasted about an hour of continual vaping, compared to 3 hours of chain vaping on a AW IMR 18650, which makes sense given the mAh for each.
It's true that the dual-coil cartomizers are not recommended for an eGo battery, but they do work. I'm sure they drastically shorten the life of the battery and can probably kill one. They should not cut down the vapor production that noticeably though. A noticeable difference in vapor production on the eGo battery is either that the battery is going dead or the carto is gunked up.
I never tried the dual-coils on a 510 battery, but I have read on a thread that some people did because they didn't care if they killed the battery.
For what it's worth, I use a REO Grand 75% of the time and a Riva (eGo) 25% of the time. Both are equal in vapor and power when using the dual-coil or Boge 2.0 cartomizers. I get longer cartomizers life on the REO. The only thing the REO does for me is give me continual juice and long battery life, which are important to me, but I could easily get by on the Riva. I am a very heavy vaper.
I don't know anything about the Rough Stack, but I am not so sure it is going to be the thing that makes you feel like everything is great. I have a very straight-forward mod (the REO Grand), but I had to buy chemistry batteries for it, a charger, I have to babysit the batteries on the charger, I have to use a multi-meter to check the batteries, I have to make sure I have Noalox on the firing pin to make a good connection, etc., etc., etc.
This is what I would recommend before you move on to bigger stuff:
1. A full kit, such as an eGo or a Riva (2 batteries to have in rotation)
2. A spare battery besides the two in the kit
3. Two boxes of Boge 2.0 cartomizers, with at least 3 of them filled properly at all times, with enough time to soak through
You might as well go ahead and use your eGo battery this weekend because you'll smoke anyway if you don't use it. Fill up a new dual-coil, charge the battery well, and practice vaping. If you can go without smoking while it's recharging, then that's great, if not, oh well - but start vaping again as soon as it is charged. Yes, your battery might give out next month, but you can consider it your learning battery.