Acebeam X60 mods

im looking at buying and modding a X60. just the usual mods, spring bypass, de doming, better heat sinking and of course a current bump to possibly 4.5A or so seeing as there is 5 leds it will get pretty hot above that current id think so i better keep it reasonable. Has anyone done one already and knows what resistors need to be modded to achieve this current, ive done a few k40s with a R100 resistor jump but not sure of what the X60 needs.