I make a 60% rye bread, and I use a buttermilk & rye soaker. Hydration is around 65%; remainder of flour is generic bread flour. I knead in a Kitchenaid for about 7-10 minutes total. I also stretch and fold 2-4 times, depending on how lazy I am.
The unbaked dough of the last 2 I've made starts to "rip" after I start to fold it. I doubt I could windowpane it. Is that typical? I know rye is low-gluten, but could I be overkneading it? Seems unlikely, but I'm looking forward to feedback.