I use the Smok Tfv4 a fair bit. Find the coils for that need a lot of prep. Got to get the juice into the cotton before you fully assemble and fill the tank. Not too mad mind, but enough so it's already soaking in. Then leave it with a full tank to soak a good 15 minutes and then slowly work up from minimum watts up to where I usually vape. It's all standard stuff really but a faff if you're in a rush.
One properly odd thing I've found is that the white o-ring on the top can alter the taste a lot. I have one which is mint condition, barely used, but if I pop it onto the tank it makes the whole thing taste burnt. No idea what that is. Cleaned it, still the same taste. Is weird. Went through a pack of 5 coils thinking they were all dodgy before I stripped everything down and replaced and discovered the o-ring was the problem.