Had this Friday night. http://www.beeradvocate.com/beer/profile/4/121053/ A nine ounce pour. Didn't upset my stomach like sours, flanders reds, and gueuze's/lambics do. Perhaps it's because I only had a nine ouncer. It was plenty sour enough, at least for my taste buds, but it was very tasty. I really enjoyed it. Are there any other American Wilds that have a subdued sour profile, but more fruity? Like a peach flavor without the lactose? Or are they all pretty much on the aggressive side, potentially having your tummy doing somersaults?
Pretty tough to get, but Logsdon Peche 'n Brett is a peach brett saison/wild ale that is phenomenal fresh, and not nearly as sour/lactic as a lot of others (looking at you Cascade). Almanac sours are great too but to me they all start tasting kind of the same after a while. Maybe you are just sensitive to something in these beers though if they upset your stomach.
Try some Berliner Weisse ales ..Not an American Wild that you seek but an ale that i think you will like they are tart with subdued sourness very refreshing with many that are fruit enhanced (peach,cherry,raspberry)
Good call on Berliners. They're also typically very low ABV (sometimes in the 2%-3% range), super refreshing and crisp, so perfect for warmer weather. I think anyone who likes Berliners (including myself) should make a pilgrimage to de Garde Brewing. I mean, just look at that list of beers.
A couple that seem to fit that are Allagash Coolship Red and New Glarus Wild Peach . Both super tasty , fruity , complex and not too sour . They may be a bit hard to find though .
Jester King fruited sours seem to be what you're looking for. Not crazy, not over the top sour, well balanced & great fruited wild ales.
if you like Nancy see if you can find Allagash currant affair , had it yesterday and it was really nice.