Yup, Velox and any cloth tape is a no-go with latex tubes. Nowadays there are better choices -- tubeless rim tape, or any strong tape like Gorilla tape.

As I mentioned above, keep the valve stem hole to a minimum.

And Silca strongly recommends using talcum, cornstarch, etc., to ease installation.

My main reason for using latex tubes is to minimize road vibration in my old school skinny tire road bikes, with 700x23 and 700x25 tires -- nothing wider will fit. Over the past few years our formerly smooth asphalt roads were redone with coarse chip seal. It's the harshest pavement I've ever ridden on. Due to neck pain from injuries and stenosis, I'm trying to minimize the jolt, without going to tubeless. Yet. But pretty soon I'll probably swap or trade my old school road bikes for a mixed terrain drop bar bike with wider tires and tubeless setup.