I don't know if it's tire problem or a tube problem, but i do know if you put tubes in a slick you need to put about 1/2 can/bottle of baby powder in each tire before ever blowing it up.
I also run tubes in my tires, but most everyone i know does not. the solution to leaking tubeless slicks is to put 1/2 bottle of dish washing soap in before installation, i mean mop it in and the tire will never leak. Everyone i know uses this method.
Just my 2 cents.
Zip.