Not sure if this is the right place, but I have a troubleshooting question for the Aspire Triton V2

Hello. I'm still very new to vaping. A few weeks ago I bought the Aspire Triton V2 and I've had nothing but issues. When I'm taking a draw on it, it feels like im sucking through a straw that's stuck at the bottom of a cup. I've made sure all the airflows are clean and open. I've tried both the 1.8 and .5 clapton coils. I've tried varying juices from 50/50 to max VG. My mod is the mini-VTC 45W. Anyone have any ideas as to what I'm doing wrong?