For a proper benchmark which will be more consistent and easily reproducible across your firmwares and kernels, set everything to performance (i.e. CPU and GPU governors), and disable any battery saving and thermal throttle options in the kernel (beware your phone will get HOT during the testing, avoid repeating it too many times in a row or in a hot weather, or don't do it at all if you don't want to take the risk!). That's how some people get some very high numbers, if not by OC'ing the CPU.
And smoothness and lags are almost all about the governor choice and its fine tuning. For instance, I can't get a totally smooth scroll in some apps with ondemand or intellidemand, even after tweaking the settings; however, with smartassv2 and lagfree, everything is very smooth and battery is also good.