Some possibilities of Capellas based on what you've posted. BTW, I notice you mix Cinnamon Danish Swirl at 20%...I use it at 15% so I'm trying to list what works for me at 15% or below. Hopefully the percentages I list will help you determine what is strong enough for you.
Apple Pie - this has triacetin though, so not sure what it will do w/plastic tank, but I mix this same % as Cinnamon Danish Swirl so maybe it will work for you
Banana - 13% with a little sweetener & I add a little TFA Banana Creme
Boston Cream Pie - I add about 1% sweetener to 10% flavor
Chocolate Coconut Almond - 10%
Chocolate Raspberry - 15% - this is very dark color & a fairly early clogger, but is very good
Coconut - 13% with 2% TFA Bavarian Cream
Double Chocolate - 10% - but I usually add something else to it
Gingerbread - 10%
Klua & Cream - 15% - but another w/dark color
Peanut Butter - 10%
Pina Colada - 15%
Strawberries & Cream - 10%, any stronger & I lose the cream
Sweet Strawberry - 12%
Vanilla Cupcake - 15%
Now I haven't tried all the Capella flavors so there may well be others. Some other things for you to consider...maybe you need to look at flavors outside of Capella, like the super conc. flavors from EcigExpress or VZ, or flavors from The Flavor Apprentice. Maybe you can look at flavors that just have a generally "strong taste" profile like menthol, mints, anise/licorice/absinthe, cinnamon.
Finally, in regards to raspberry: I haven't used Capella raspberry, but I really like the TFA Raspberry at 10% so maybe something you want to try.
Hope this helps.