I have to "+1" on the tank -- I have one and I keep a ~1ohm coil in it. It's my "totally alternate flavor" tank. And for the record, at that resistance, I probably run it at around 17 watts.
Suggestions.... (Uwell) Crown tanks @ 0.5ohm... That's nice on the VT. 35-50w depending on the juice. (eLeaf) iJust 2 tanks with Atlantis (or eLeaf) 0.5 ohm - Big tank, pretty standard stuff. If you want massive (no pun) flavor and a freaky-smooth draw, the iJust 2 with a Vaporesso cCELL coil at 0.9 ohms... That's like turning on a faucet even at 0.9. 30-37w depending on the juice.
If you're looking for a (from what I can tell) nearly "universal starting point" on most coils, adjust your wattage to give you around 3.7-3.8v -- That's where you'd be on a non-regulated device. So, it's a really "safe" starting point (although 'breaking in' a coil at lower wattages is a nice idea also - start really low, a quick puff or two. Bring it up a couple watts, another quick puff or two, etc.).
Don't throw out the Mega - But move it to the backup line. My (eGo) TRON tank is in the same line. It's a tank - but it's "meh."
Bangin' mod though -- Heavy, but great battery and features. If you're ever looking for a 2nd (Heh... "If" - That's funny) the VTC-Mini is another fine choice from the same line. Runs a single 18650, so nowhere near the battery. But light, easy to hold, etc. I usually have both (VT/VTC) for long days away.
IMO/E, YMMV, etc., etc.