@Zazie .... Please keep in mind that because you ordered the Zenith tank, that it is a lower wattage tank that is not capable of keeping up with your high powered mod should you decide to crank the wattage up.... I can't remember the exact specs of your coils but I believe one of them will handle about 18 watts or thereabouts.... But your mod is capable of delivering much more (75 Watts) which of course would severely mess with those coils if you crank it up past what the maximum rating of what the coil is rated for....
As I am sure you are aware, that the kit comes in two flavors. You could have ordered the kit with the powerful sub-ohm tank.... The coils in that other tank would have been capable of taking the full 75 Watts of power from your mod (or most of it) should you ever decide to crank it up that high.... But because you ordered the lower wattage tank (MTL) then you can't attempt to do that without causing coil problems.... Obviously, you are desiring a mouth to lung type of vape.... I watched a couple of videos of people using the Zenith tank with that specific mod and they were getting LARGE amounts of vapor production even though their wattage was only set to about 14 or 15 watts...... For the price, that is one good little system..... It will take you awhile of playing around with it b4 you get it set exactly how it pleases you.... Also, please keep in mind that the mod and tank are only HALF of the equation.... In order to get a satisfactory vape, you also need a juice that suits you....
Too much PG in a juice will cause a couple of things.... First off, the more PG that a juice is composed of then the thinner and less visible the exhaled vapor will be (some folks like this). If you want to easily see your vapor, then higher VG juices will provide a thicker/denser vapor (other folks like it this way)..... Also, more PG will tend to dry out the mouth, nose and throat more than a higher VG juice.... On the other hand, PG can provide a good throat hit and an exact sensation of smoking provided that the amount of it inside the juice is to your liking.... But, PG isn't the only thing responsible for a good throat hit and sensation of actually smoking..... I mixed my own juices for quite awhile and did lots of experiments..... I discovered (along with loads of other people here) that the higher the nicotine level of the juice then the stronger the throat hit is..... In other words, Nicotine acts like PG when it comes to the feeling in the throat and lungs while you vape..... The trick to the vaping subject, especially for beginners, is to experiment lots with various juices of varying PG/VG levels as well as Nicotine levels.....
There are some general thoughts to keep in mind with these larger vape units like what you are getting.... If you like lots of Nicotine in your juice then you may want to back off of the PG levels inside the juice other wise you will get too strong of a throat hit... The reason is because BOTH nicotine and PG provide burning throat sensations..... On the other hand if you have more VG than anything else, then your vapor will be very thick/dense and will not provide much of a burning throat hit (if any) ..... So, between the two extremes you will find what suits you best....... Most long time smokers, when they start vaping, they desire to get a vape that feels just like it did when they smoked... Believe me, this is easily possible via vaping..... It's a simple balance between PG, VG, and nicotine levels as far as the juice is concerned..... The power setting of your device also effects this but you should not worry about this stuff until later after you get to know your mod/tank and get to learn more about vaping....
You mentioned earlier that the PG was too strong for you..... So, I suggest that you select a juice with a bit higher VG. The throat burn will not be as strong plus the vapor will be denser.... The important thing to realize is that if you start vaping on that device and everything seems to taste horrible or seems to suck, please do not give up. The reason is because there are lots of variables to vaping and one little thing that is not adjusted properly can cause you to be dissatisfied.... The usual culprit is the juice for beginners .... They either have to much nicotine in their juices or too much PG..... So, once you get a juice to your liking then adjusting the mod settings and selecting the coil resistance becomes much easier.
Also, keep in mind that if your burning throat hit is too strong and you are not using very much PG then chances are that your Nicotine level in the juice is way too high.... Remember, BOTH Nicotine and PG can produce harsh, strong throat hits. So, even if you lower the PG you may still get harsh burning throat hits if the nicotine level is too high. Keep all this in mind while selecting juices.