may I ask what is the problem with odd number polygon-shaped string?
Blackcode is softer than pro-hurricane but hold tension is similar
I think MSC Hex black is soft, it drops tension n the first few days too but then maintain well after that.
It is the best poly awarded in 2009.
Oh... you want to choose the ploy string for hybrid? you can take a look on this one : KLIP Optic Nerve 17 String (http://www.tennis-warehouse.com/ ... CKLIP-KOPTIC17.html). I'm using it in cross and the main is Head Natural Gut/Tecnifibre X-One Biphase in my 2 pcs of Yonex RDS001 MP. The feel is really good and it's not expensive ($85 for full set)!