I need a little bit of advice on overclocking using setcpu

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http://forum.xda-developers.com – Hey XDA i bought the setcpu app on my nexus and tryed to overclock it...:( as i realised it doesnt really overclock it as it only goes to 1.3ghz which is the max the stock can go lol i take it to actually overclock the tablet beyond 1.3ghz i need to install a new kernal perhaps a custom kernal? also whats the best kernal i could install instead of stock? im looking to overclock it to the most fastest but safest speed i heard 1.8ghz atm also want to here other users thots on which kernal i should try, also if i ever decide to reutn back to stock does everything as in the kernal a (HowTos)