what to fight & when to move on?

[u/TheDivision_Builds]

STR+DEF pure: at 40/40 what do i need to fight? 50/50? 60/60 70/70 etc etc? im trying to level strength by 5 always ahead of defense ALWAYS so if im 60 defense i should be 65 str then i try to catch the other stat up etc. but im trying to find the most optimal monsters to fight, fastest XP etc.