I run a Mini Davide. What I've noticed is the coils flood and I get that gurgling when I use my local B&Ms 50/50
juice, but it vapes just fine when I use my own 25/75 juices.
Sometimes it will still flood with the 25/75 in it. But that's normally when I need to wash the coils out. So I clean the coils, dry burn it, put it all back together, let the wicks soak a little, and I'm good to go.