Hustler Cash,
TWM Cash and
Serious Cash are some of the affiliate programs that came to my mind when you mentioned longer clips.
Busty Beauties contains HD in following niches:
Straight: Big Tits, Editor's Choice, Hardcore
Ethnics: American
Program:
Hustler Cash (98 sites, NATS). Revenue: 60%, $35 PPS
Pay method: check, wire, Payoneer, Paxum
Promo:
Photo FHG (580), Video FHG (978), Mixed FHG (102), Tube clips (711)
Pounded Petite contains HD in following niches:
Straight: Hardcore, Petite / Small tits
Program:
TWM Cash (31 sites, NATS). Revenue: 50%
Pay method: wire, wire US
Promo:
Photo FHG (1), Tube clips (3)
Disgrace That Bitch in following niches:
Straight: Facials / Cumshots, Hardcore, Reality / Storyline, Teen
Program:
Serious Cash (30 sites, NATS). Revenue: 50%
Pay method: check, wire, Payoneer, WebMoney, Paxum, eCoin, ePayService, RedPass
Promo:
Tube clips (5)
You can find a lot of affiliate programs with high quality FLV clips that will be long enough for you, and they are all listed bellow:
Paysites with FLV tube clips @ SignBucks.com