Provia 100, rated at 80; processed normal; no filtration when shot
I xprocess a lot and rate the film as follows:
velvia 40; provia 80; (30cc mag filter and associated 1 stop slower is helpful for these films)
Overexposure and pull processing can work if the film is fresh otherwise the film realy blocks up if you just over expose. Older film that has lost a stop or so of Dmax is were I think this rumor started. Velvia, Provia, E100s/sw/vs are so contrasty when xprocessed that they can become unprintable. But if those same films are older where the Dmax has slipped, then you can 'hammer' the film with light, get great saturation interesting crossover and a printable neg.