I don't know if it was a nod to the Bad era as much as it was Michael probably wanting a funkier sound. They probably moved them around for something new (idk tbh). They increased the speed of a lot of songs in 1993 to make the show run faster and also to help MJ keep up his energy. as a performer who's done full hour and a half long shows myself, when theres a faster tempo that usually helps my energy (thats my guess but I could be wrong)
as for Michael's health in 93'- a lot of shows were cancelled. As a performer he was fine, but in general he was not that ok during the 1993 leg. they cancelled over a dozen shows in 1993, either due to Michael's health or due to the show being banned in certain cities in the middle east.