a softer board will definetly make a different on rails and butters. i would never ride a VERY stiff board maybe if you doing the mount 180km/h hehe and with no pop i would go for a new board. go for a softer with true twin and zero camber or rocker.
nitro T1: a very good allroud parkboard but still you can ride the BC
K2 www: funny playboard for the park and butters sooft with a nice pop