Can't use tubes in Weld Wheels Draglites?

I've raced with and without tubes. I prefer tubes as it seems to stiffen the sidewall and makes the tire last longer. Tires without tubes usually leak especially over time and you always have to keep adding air, esp with the Hoosiers. Car also seems to be more consistent as far as reaction time goes as well. I've ran Hoosier, but I'm mainly a M/T guy. I get tractor tubes from my local tire shop and mount and balance my own tires. I've used Weld Draglite, Prostars and Centerline wheels thru the years. I sprinkle some baby powder in the tire before inserting tube. I could see you having 1 bad tube, but 2 makes me think the guy mounting the tire is doing something wrong.