V4L has some pretty strong flavors and if you have a KR808D-1 threaded device or adapter you could try their sampler packs of carto flavors (their juices are all 30ml so those would be pricey to try). Their WOW RY4 was strong when I tried the WOW tobacco sampler. Some of their fruit flavors are also strong but they were ones I did not like (mainly overly spiced apple-related flavors). Their shipping is high so sing up for the sale emails - lately they seem to have almost daily sales, often with 30% off on orders over $50, 20% other orders, but only 10% off certain models and bestseller flavors of juices/cartos.
Re flavor in general
1 - If you just quit cigs it could take a couple of weeks to get your tastebuds and your nose mostly back
2 - Some people expect vapor to taste as strong as drinking juice or eating food - it won't. It is vapor.
3 - You need to smell the vapor. a BIG part of flavor is aroma. Do you know a sweet onion and an apple taste the same if you don't know which you are tasting and can't smell them? With vapor you are missing the visual of what you should be tasting so you need to smell the vapor occasionally.
4 - If you use medium to high nicotine or vape excessively, your tongue can get a sore burnt feeling and interfere with taste (nicotine is a skin irritant)
5 - Drink fluids often. I think drinking cold water helps to get the vapor flavor back. Any other flavors hanging around in your mouth from food or drink will interfere with vapor flavor.
6 - I recommend alternating flavor types - switch between a sweet and a non-sweet
7 - A dirty atomizer or a gunked up or singed carto can loose the sweet of a sweet juice.