Juice makes a big difference, at least in my experience. I've got a high VG juice that does well at 10W, but most of my 80/20 stuff tastes burnt over 8W.
Damn, I like the look of that Sentinel!
the juice i have is either 80/20 or 50/50 pg/vg. i only take tobaccos up to 8, but then again, i don't like most tobaccos. my itaste v3s are cheap and that's why i like them. sometimes, for stuff like cheesecake, i wish they would go lower than 6 watts. i use alot of mini-davides and the coils are just plain crazy all over the place. instead of 2.2 ohms, some go up to 3.6! i try (when i can remember, to put the lower ohm ones on my tobacco juices and use the high ones for my dulce de leche and root beer.)
i do agree that 8w is usually too much for the juice. i vape mainly MBV stuff, and the clearo matters too. tobaccos run best for me in evods, and horribly the minis. the v3s are nice, but if you use large tanks (even those clearos called tanks), the tank seem to suck a lot of the power out of the battery. you put a tobacco in anything other than an evod, you get mute, mute, mute, burning as you increase wattage. that's OK by me, cuz the only MBV tobaccos that i can deal with are USA Mix and Coumarin. THAT was good, because it made me try all the other flavors, ddl, root beer, whipped cream and a few others that are by far my favorites.
i think the taste in a protank has an edge (very slight edge, but it could be the better coils) on the flavor on the minis, but if i use ptanks, i vape 5 mils of juice a day. the minis keep me closer to 3.
i just got a boatload of MBV and FW flavorings so once i have some juice steeping, it is finally time to retry making coils.
i just got some AROs, but they are nearly as heavy as my ptanks. i think they are just beyond the range of the v3s. i tried some tobaccos in them (thinking they were "super evods") and flavor was unbelievably muted. but their coils are 2.6 ohm. (which i wouldn't mind in an evod. once i get the hang of coiling, i'll try to make some 1.8 - 2 ohms for them to balance them off. they work good for my root beer (which i'm still tweaking) and maybe whipped cream will go in the other.
gotta find the right "tanks" for the right juice and the right coils for the right "tanks". that makes it all interesting. it's like "mise en place", everything in it's place and a place for everything.
once i get the coils worked out, i can re-evaluate which juice goes where. (and a what v/w)