Well after almost a week of tweeting this is what I have found to be my most efficient clocks. With this setup I am very stable and get my highest PPD. The bonus to this is when playing I found depending on where my clock were set I would start to get the high pitch noise described by many with these cards. However, when I am running these speeds the sound virtually disappears.
650C/1650S/1350M with fans at 50% temps read 73deg C with this I am getting 8700-9242ppd on the 353 WU, 8500-9479ppd on the 384 WU and around 6898 - 7237ppd with the 511WU.
Not to sure how that compares but it is what I am getting.