I had several such issues when I used clinchers. Mainly alloy rims with the brake trace blowing out. I've had no such issues in 70Kish tubular miles (with good glue).
I use disk rear (now) and rim front. We are 360# tandem, but was riding 500# (most massive highest torque stoker I begged not to break cranks) with the same no problem on tubulars.