Just because a thousand other people say a 'tank' is really good doesn't mean you will like it / get along with it or should, or there is something wrong with you/your style/method of vaping if you don't like it too.
I am a 50/50 e liquid vaper, you should not need to add DW to 50/50 liquids to get them to wick in any delivery device as the ratio is already quite thin compared to any VG heavy blends.
I found many of the popular 'sub ohm tanks' just flat won't work for me, similar problems as you describe none with any reasonable answers or cures.
I could list a full page of highly recommended 'best ever' delivery devices that I consider horrid wastes of time, effort & liquids.
The three tanks you mention would be in the top 12 - 14 or so on that list, IMO.
The original Crown tank, kangar sub/top tank, original Atlantis, Triton both full size & mini worked especially well for me.
Yes, you have to move quite a bit of air through a DTL style replaceable head to create enough pressure/vacuum differential to pull liquid into the wicking material. Restricting the airflow may help.
Many flavorings don't do well at higher power levels / with the higher heat & increased airflow of sub Ω coils.
Higher watts & more airflow does not = a better vape in any way, it is just a different method used for individuals to find what works best for them.
I doubt there is anything wrong with you or your vaping method, just need to find delivery devices that work best with your individual preferences.
The whole MTL vs DTL thing is odd to me, I can & have DTL any delivery device, you will always run into problem trying to mtl or semi mtl a delivery device designed for wide open DTL.
Certain flavorings & especially sweeteners can do some really weird things at various power & airflow levels, especially when talking about the goopy gunky ones that use 12%,15% or more total flavorings & sweeteners.
I don't vape sweet flavors or any that you mentioned so that's probably all the help I can give.