34 is a little too thin and thus too high of a resistance. At 4 volts on 2.5 ohm, you are running 6.4 watts, which i would say is way too low on a mesh wick.
I recommend using 30 gauge.
Also, your
vape depends largely on your build quality, like how you rolled the wick, how you wrapped you coil... Many variables. Check out some tutorials on youtube.
If you have good pictures of your set up post here and i may be able to help.