If your starter is over fermented... Don't mix the final dough with it... Start over!
If your starter is over fermented... Don't mix the final dough with it... This happened to me again this morning... I proceeded to mix the final dough with the overfermented starter... The dough never came together and remained a sticky mess... Yuk!
I should have just tossed out the starter and started over and not wasted 2kg more of flour...