What wattage can I run safely?

[BGMtC2]

Hey everyone, pretty new to vaping and definitely new to this forum, but I've got a question that the guys at my local shop can't give me a straight answer on, I've got a kangertech nano and I put a kanger mini tank on with a rebuildable coil.

Now I've got a dual coil set up, at 26ga kanthal with 7 wraps each at a 25 diameter, it's measuring .4 ohms and at 20 watts it's giving me 2.7 volts, how high should I take the wattage, mind you it's a 50 watt mod.

The coils are firing evenly from the center out and I'm running low on cotton. Funds are also pretty low for the moment haha I want the most flavour from my pull and at 20 watts I don't get much of that, what can I do without instantly killing the wick?

 

[tmcase]

Increase your wattage a little at a time until the flavor is good. I increase until the flavor is good and then push it a little more to see if I can get more flavor. If I start to get a burnt taste or the flavor starts tasting not as good then I back off. A slight burnt flavor won't ruin your cotton. Increase by .5 watts at a time, take a couple hits then keep doing that until the flavor is just right.