Guys first of all thank you each and everyone for their answer.
Secondly, i flashed only the big rom file (400mb aprroximately) prior to writing the older post. My evo runs ultra fine for the moment.I didn't flash the extra kernel or any radios, although on previous atemps i did flash the extra kernel too.
If i come accross the usual glitch of the wifi (slow or no signal at all), i'll flash the radio also mentioned above.
If i must do the process, how the priority must be ? Rom> kernel> radio ?
Must i do anything between flashing them ( wiping anyting) ?
My radio for the time being is: 10.59.9020.00U_10.15.9020.06_M