Brake issue on my stepdeck - 2010 Manac 53 ft slider spread

Having an issue with the driver side rear axle brake on my stepdeck and wondering if you guys have got any advice on what to fix. I just replaced the shoes on the trailer and one drum about 6000 miles ago. I am having issues with the brakes where I replaced the drum specifically locking up when the others arent (anti lock brakes 2010 model year). It has also had the axle seals replaced on this axle (both sides) and new hardware kits were installed with the shoes. The brake is adjusted right but when I apply the brakes, this one wants to lock up and just had (only this brake) give me some smoke when I was coming down Ashland pass on I-5 heading home so its obviously applying itself harder than the other brakes. Got any ideas?

 

I was thinking that it could be the valve but wanted some good second opinions before I go tearing into it. I dont think its the can but of course I could be wrong.

 

I was wondering about the slack adjuster . Right before I replaced the brakes and this drum I had noticed a little of the issue back there but decided since the shoes were worn out that it had something to do with it. The reason I replaced this drum as the others are in awesome shape is that it had a little lip on it and DOT frowns on that. I will check the out of round issue and will check out the slack adjuster very closely.