Update on my 2016 Chevy Cruze LT at ~94.5k miles (5K in) for those following along -
Not much to report other than it is still about 80-90% better than it was. Torque converter lockup issue that appeared around 800 miles in for a short period at low RPM has gone away. Light to full throttle upshifts are all smooth. Still a little bit of slip maybe in 3rd and 5th at WOT when cold but hardly noticeable. Some downshifts when slowing can still be felt, but not major. The car is aggressive in cutting fuel / employing traction control when there is slip in the transmission so at WOT really manifests as a hesitation and loss of power, but it seems very normal compared to how it was prior. Around 100K, will do another drain/fill, I have 5.4qts of Valvoline Restore and Protect left.
My friend with a 2017 Cruze LT has just done a drain/fill at 86K after starting to experience some of the same hesitation and harsh downshift symptoms I had, missed 3rd on an on-throttle downshift and car selected 2nd after bucking and hesitating for several seconds. His also had never been changed and was dark / silvery as well, but also smelled very burnt. We got 5.6 qts out of his vs. 5.1 out of mine, somewhere around 60% exchange. First drive after and to/from work over last couple nights he said were positive. He also plans to do a second drain / fill with Valvoline Restore and Protect before 100K.