Fps Drop

Ive tried every autoconfig.exe , steam startup codes, and in game settings and videconfig settings, my specs and windows are updated im getting around 110-140 fps most of the time but sometimes it drops to 70 80 and because of that its not smooth its like laggy .Im playing with 1920x1060 60 hz monitor ive tried rtss scanline sync with -1 -20 -30 everything it capped my fps 60 and it was so good ,game was smooth as butter but i get input lag so i cant play that way too.Is there a way 70-80 to 140 fps without lag or scanline sync 60 fps without input lag my cpu usage is like 70-100 but most of the time 95+ and my gpu usage is 70-100 too but its unstable like my fps
My specs=

2x8 16 gb ram

i5 6500 3.2ghz

msi gtx 1060 6gb