Ya Netarchy 4.1.9.1 has hands down been the best kernel for me. I get the best battery life and crazy speed too. Just keep in mind, not all Evo's are the same. I've had 3 different Evo's and all 3 had different overclock tolerances. My first one I could O/C to 1190 no problem. Anything past that, instant lock... The Evo after that couldn't go past 1152. With my current Evo it can go up to 1228 with no issues at all. With certain kernels I can go as high as 1267. My advice is to create a profile in SetPCU for charging. Set the MAX at 998. Because if you set the main max too high and it locks and reboots, youre phone is gonna be in a bootloop hell. By having that charging profile if your phone locks and reboots, just plug the USB in and it'll now run at that 998 MAX. Then just go into SetPCU and lower the MAX.
The best way to increase battery life is to create a profile for screen off. Set min and max to 245. Dont do 128 because when you wake the phone up itll be too sluggish. Also when receiving a call it might be so sluggish you could miss a call.