Not to confuse the issue, but I tend to agree with the other advice. Change your PG/VG ratio to about 40/60 (and be prepared to go higher if you're still not getting the throat hit you want).
Try doubling your nic percentage for a batch or two, and see what that does for you (being aware, over time, that you'll probably want to reduce it again after you are firmly off the sticks.)
Try doubling your flavor percentage, see what that does. You should be able to taste green apple, it's pretty powerful.
Mix in small batches until you get something close to what you want. Remember vaping is a journey, not a destination. If you're like most of us you'll be fiddling with it and trying new things for the rest of your life. That's perfectly normal
Get a small roll of 28 gauge wire (and if financing is not an issue) even a small roll of 32ga to go along with it. 20W is really too low for the 26, no matter how big the coil. The ramp time (the time it takes cold wire to heat up to vape temperature) is too long. Your problem may be you push the button and your lungs may be half full before you get any vapor. Try chain-vaping three hits in a row; if you find you are getting better vapor on the third than the first, a cold coil is at least part of your problem.
Steam Engine is my favorite coil calculator and I am glad to hear you're using it. But you
absolutely have to know the diameter of the mandrel on which you wind your coil in order to make it work. Take a look at a coil kit, all of which will have a selection of mandrels of different size, as well as an ohmmeter, a tool I highly recommend for safety prior to mounting and firing your coil. I personally don't like any of the coil winding tools like the Coil-Master, but may people do. My favorite coil tool is a simple stainless steel hexagon bar step-turned down to diameters from 3.5 to 1 or 1.5mm. Drill bits, which have a known diameter, are a fine substitute, if perhaps a bit expensive for a large selection.
Note the "heat flux" section below the answer box in Steam Engine:
The depiction of 200 in the box is a measure of radiated power from the surface of the coil wire, using the coil depicted in the calculator, at whatever wattage is shown on the line below. A broad hint is also offered by the color of the flame icon to the left. This is a really useful tool. Once you find a power setting you like-- I prefer between 150-200-- you can use that box to determine how a proposed new coil will vape or, alternatively, where to set the mod power level to get you the warmth of vape you like. Changing the coil build, or the mod wattage, will move the number around. Therefore you can "experiment" with coil builds and get a pretty good idea how they will vape before you actually make the coil.
Part of the problem you and all new vapers face is there are a lot of variables involved and they are interdependent; change one thing and a lot of stuff moves around. This is simply part of the journey; everybody has to deal with it. Getting another mod is a good idea because you can drop it and break it (ask me how I know...). Not having a backup when your mod breaks is the fastest way I know to start smoking again. But there isn't anything actually wrong with your Kanger setup. If it isn't satisfying you it's far more likely you don't have it dialed in yet than that something is actually wrong with it. I won't offer a suggestion for different kit as I am not too well acquainted with gear in the beginner regimen; but others here are and you will get all the recommendations you need, I feel sure. The best way I know how to get dialed in is to try to limit your changes to one thing at a time. You can start immediately, using the juice you have, just by raising the wattage a bit to see if this helps you.
When you go to the store, they may have a "juice tasting" bar. If they do, use it. You might find a new flavor you like. If you can get one that is acceptable, try to buy a small quantity of the same flavor in several different nic strengths. That should help you determine where your nic level should be. Once you have that, then wiggle the PG/VG ratio to get the throat hit/vapor production balance you like.
The key is don't give up. Understand and accept it's going to take some time to find what you like, and that nobody can really help you with this; it's too individual because you're dealing with personal preferences. There is no "wrong" way to do vaping. If it's keeping you off the sticks, you're doing it right. Period. No matter what anyone else says.
Good luck and keep asking questions. We'll be here for you.
PS: if you can find a small quantity of rayon wick, or beg 6" of it from somebody hanging around the shop, give it a try. I like it a lot better than any kind of cotton.