Thanks for posting that-- I'll have to add those two yeasts to my list to try. There isn't a whole lot of information out there on Frankfurt style Ebbelwoi and I've never found it available for purchase in the US. I had a pitcher of this served with soda water when I was there a few years ago. Did you add any acid to make it more sour?
Possmann is the largest commercial producer of applewine in Frankfurt, I have been to their factory, its cool, they somehow salvaged reused the inner hull of a WW2 U-boat as a huge fermentation tank right after the war since it was the largest tank they could find and worth a fortune then in materials . They make the standard, clear, bone dry apple wine that you purchase in stores. It is not really 'sour'. Here is a link for all the Possmann distributers in the US, if you live in a state listed, call them and ask where to buy. When I moved back to Boston from Frankfurt 15 years ago, this was not an option.
http://www.possmann.com/dist.html
I actually prefer the Ebbelwoi that the individual Apfelweinwirtshafts and Apfelwein restaurants make themselves to sell on-premise, (my all time favorite being Adolf Wagner, I practically lived there for a few years) . This is not clear like the store bought stuff, and is definitely a bit more sour. These individual restaurants are like micro-breweries all over the city, so there is a ton of variation. They make there own and serve it out of bembels ( applewine pitchers) based on how thirsty you are, each bembel has a corresponding number, indicating how many .33 liter servings it contains. You can get them as small as a 5'er or up to a 32'er at some places.
Applewine and dry still cider are pretty much exactly the same thing, Frankfurt applewine producers uses a variation of a crab apple to get some astringency and tartness, but they never add sugar or flavorings to their juice pre-fermentation. Any adulteration is done 'in the glass'
Back to your question, I find that these yeasts really maintain the apple flavor and aroma that mimics the applewine that the restaurants make, they don't filter it the way Possmann does, and its really like a large scale homebrew operation. If the starting apple cider I use is flat, I might add 1/8th -16th teaspoon of tannin before kegging after tasting. I also find that the C02 from the Keg system adds a bit of sourness as well, though this my be in my head. It definitely tastes better carbed.
The one batch I did that REALLY reminded me of the restaurant Apfelwein had JUST started to get a few tiny patches of the white film in the secondary that indicates a little acetic fermentation had started. As soon as I saw this, I crashed it and kegged it and drank it.
The acetic 'accident' notwithstanding, the normal batches using the two yeasts mentioned and low and slow fermentations are as close as I have come to replicating my favorite beverage.
Cheers
PS
Forgot to add the bit about the acid
Yes, I test the acid up front using a wine titration kit, and if its less than 65-70 titratable I add malic to get it up to 75-80