I'm not new to this whole DIY business but have had limited success. I've noticed that a lot you use way more VG than I do. I've always mixed 70/30 pg/vg. Sometimes 60/40. I used cargo tanks for years and had decent luck with my flavor and throat hit (which I like). But I've recently switched to Aspire Nautilus and Kanger Protanks on an Istick ( I have a 30w, a 40wTC, and a 50w. Love those btw. My flavors aren't coming through like I thought they would and my chest feels heavy,,, actually hurts sometimes. I've backed off on the nic, down to 12% but that doesn't seem to have helped. Should I cut down to 6%?? Should I increase the vg?? Have to admit I'm a little stumped. Your thoughts would be greatly appreciated 
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