reporting back some more experiments to this topic - if others are researching.
still trying to get my hands on Stevia/Pyure - it's not available here - and other Stevia products are rare.. maybe when i travel to US - or it would be easier to negotiate with one of the flavor makers to create a new sweetener product based on Stevia
but yesterday i found this in a local store - it's sucralose-based. the effect (1 drop per 10ml) is just amazing - now i really know what everyone is excited about. it doesn't only sweeten the juice, it does something more. the fruits are well-blended and harshness is gone.. wonderful! [edit: i used a sweetener before, but the effect here is a lot more "obvious" - i have SSweet (CAP) in my next shopping list to add to stash too]
i then cut it in half with PG so i can better use it in my mixes - wanted to try smaller sample of different mixes - mostly fruits - so far good results. yes, it causes coils to gunk.
i also mixed some powder stevia in PG - following the recipe from @Chewy (big thanks) with few drops of ACV - and it seems i like this one even better but need to do some more testing and try to find a better Stevia Powder.. but all good. this kid has a new toy - my mixes have upgraded flavors -- thank you guys for all the help