Well, the only thing to be sorry about would be a lost WU - you decide just how sensitive you'd be about that Otherwise, why not, just find out what vcore the unlocked CPU is stable at and stick with that.
In my experience, it is possible that future folding clients will make that lower voltage unstable so you may need to kick it up in the future (happened to me going from 6.27 to 6.30 SMP client).