hi there, welcome to HeRO!
well imho 5x is not that high... still considered low rate by RMS because it's under 20x... but anyway, imho you'll find that the challenge is still there, so i don't think you have anything to worry about
anyway, customs info etc are in the forums and wiki, i believe a vet like you won't find any trouble figuring out the gameplay kinks etc. GL and HF!
-w-