Second Gear Band 727

I bought a new tranny for my race car this last winter from a reputable mopar tranny builder. To start off with the tranny wouldn't shift correctly under load. Found the problem with it the piston assembly was bad. Builder sent me another piston assembly to replace it. Working fine until this last weekend. Started doing the same thing again. I adjusted the band up again at the the track and it started working like it should.
My question/concern is having to adjust this band again. Should I pull it out and have it checked for wear or just assume I maybe didn't get it adjusted properly???