Noisy vinyl from Classic Records

Most of the Classic records I've bought have a mild to substantial dish warp, and many suffer from excessive surface noise. The dish warp and swishing or crackling noise in one channel is usually caused by an insufficiently long pressing cycle. Thick vinyl is harder to press -- the record has to be heated longer and the cooldown has to be longer too. If the vinyl isn't given the full time to flow and form completely around the pressing die, noise is the result -- often primarily in one channel. I also dislike thick records because they screw up proper vertical tracking angle. I have yet to find a heavy vinyl record that demonstrates any superiority to some of the better, thin, Japanese pressings.

There may be hope for Classic Records. I have a few clear vinyl records that are well pressed (not the 45 rpm "Clarity" records). A friend collects the Clarity records, and those are terrific sounding pressings too.

When a record is pressed, a small biscuit of vinyl is placed on the stamper and under pressure it oozes out to the edge. If this flow is not perfect, a condition, often referred to as non-fill, can result in noisy records. Typically the noise is at the beginning of the record, and often it affects one channel more than the other. It can sound like a lot of crackling or a tearing sort of sound (if severe).

I've heard mild forms of this on some Classic Records.