When you say you have an Eleaf iStick v1, are you talking about the iStick 20W, iStick 30W, iStick 50W or the 40W TC (temperature control)? The 20W doesn't read the temperature correctly in watts and even in voltage mode, it tends to run hotter than what the screen says. The others are more accurate. If you're using the 20W, switch over to voltage mode and set it as low as it will go. Vape. If that doesn't do it for you, turn it up just a little, vape. Continue to go up slowly until you get a slight burnt flavor or a harsh vape. Turn it down a notch. That's your sweet spot for that juice. The KPT2 is a very good tank and is a good, solid set up in general, especially for someone who is new to vaping. Another thing that could cause the "burning" of your throat (what we call "throat hit"), is how much PG is in your juice. More PG, more throat hit. More nicotine, more throat hit. What is the level of nic and PG/VG ratio in the juice you're using?