After researching the system, the tank portion looks solid to me. The weak point is the battery. Normally I'd recommend getting either a 30 or 50w istick to go with it. But those coils are rated at a minimum of 30 watts. Now, my isub coils are rated 20-35 but I'll be damned if i can get them above 20 without frying it. My subtank mini is rated like 15 to 30 and performs beautifully even at 30W. So you can see that sometimes the recommended wattages aren't exactly accurate. Without actually sitting down and playing with the ijust I couldn't say how much power you actually need to get a good vape out of it. So in this instance, I'm not sure what to recommend.
In this situation I'd head over to the store and ask to play around with a few batteries and see what wattages you'll actually be using. They always have a few unboxed batteries around you could try. I know how those stores work, every time something new comes in, one comes out to be played with. Stick it on a 50 watt istick and set it to 20 watts and see what happens. Work your way up until it's doing what you want. If it's doing what you want at 20w get a 30w istick. If it's doing what you want at 40, get the 50w istick. If it doesn't perform to your preference until 70 or higher get the 100 watt istick and so on. Plus it's a vape store, I guarantee one of the dudes working there has a 200 watt mod he doesn't know how to use that you can start low with too. lol.
Anyways, I ramble. Good luck.