Yes you will get better results with the dynamic clocking bitstream from glasswalker, mine has run for months stable on the glasswalker bitstream at 215-229 m\hash. However there is a problem with Bfgminer where they aggressivly downclock, some sort of wierd bug., if this bug wasent there Id use Bfgminer. I use MPBM Miner instead since thats what Glasswalker built them to run on and it works great other than failover. For whatever reason when MPBM failover accurs a few times the cm1 Downclock and you have to reboot MPBM.