Televised coverage kicked off with a thrilling showdown as Tony Harrison (22-1, 18 KOs) got the unanimous decision over Cecil McCalla (20-3, 7 KOs).
The final televised fight of the evening saw undefeated middleweight prospect Caleb "Sweet Hands" Plant (12-0, 8 KOs) capture a unanimous decision over Tyrone Bruson (22-6-1, 21 KOs).
"My right hand was working well for me, but I stopped throwing it and started focusing too much on my jab," Acline said.
"I didn't fight for a year and a half, and then I jumped right into the ring with a hungry, young lion. I wanted the fight, but sometimes pride takes its' toll.
"Fighting on a PBC card gave me a big opportunity to show the world what I can do. But (Charlo) was stronger than I thought he'd be.
"I don't know what's next. I'll talk with my wife first. I still have a strong desire to get in the ring, but I'm 39 now. My health is very important to me. I want to be there for my family and my daughter. So we'll have to wait and see."