If you are using stock ProTank coils with silica, that is your problem (imo). For one, there isn't enough wire material in the head, suspect they use 32ga wire. Secondly, silica just plain sucks!
My suggestion, go out to YouTube, watch a couple videos on how to recoil a ProTank. Go to Lightning Vapes, order some 30ga wire (100' for like $5), go to Michaels and get some Sugar and Creme 100% cotton yard (it's a 4-strand yarn), this is a few bucks for a ton. I boil a foot or so for 20 minutes just to get any gunk off from storage or people handling it - let it dry at least overnight and store excess in an open container. Wrap the coil around a 1/16" drill bit (I do 9 wraps and am right at 1.9 ohm +/-), drop it in. Be careful not to tear or mess up the insulator. Feed 2 twisted strands of the yarn into the coil and use the other two (loose, not twisted) to set on top as flavor wick (unless you use heavy VG juice). I do this for all my builds but I don't use anything heavier than 50% vg. You may get a bit of off taste initially, some do using cotton, but it'll shortly pass after two or three pulls. This should improve all your flavors.
If cotton doesn't do it for you, there are other materials such as bamboo yarn (also at Michaels) or many are starting to go to ceramic wick which is like $8 for 1 foot.
Take it slow and you'll be fine. I've been doing the above for a year....not onto RBA's for me. Waiting to pull the trigger on my first Mech (getting a Reo).
Best of luck!!