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I mix at 70% but my starter is 100% hydration so when I add a few hundred grams of that it ups the overall level slightly.
I haven't had much success will higher hydration loaves - I don't get as good a structure normally, however the @dancing james method of gradually adding the water throughout rather than dumping it all at the beginning is interesting.Not sure what would be the benefit of higher hydration (say 80%) but it does seem that the international society of internet sourdough dickhead bakers* use it as a barometer of baking skill.
*Hoping to get accepted as a member next year
Started off with Tartine then have picked up bits and bobs from FWSY. Been making sourdough for about 10 years now so my method has probably evolved a bit away from both of those.
Most consistent improvements for most people are using a Dutch oven, and a cold overnight prove.