hi,
so here are the BlendSpaces… note you could use AimOffset too but then the animations need to be adaptive and your idle animation must be from the same position made… mine is not so i use blendspaces…
ok first here you can find the old 1D aimoffsets / blendspaces
and here are the BlendSpaces
all BlendSpaces use -1 - 1 but you can also make it -90 - 90 if you like… just multiply the DotProduct by 90… but to cut this calculation out i made em only -1 - 1
i combined the idle with TurnInPlace in a 1D BlendSpace… you can make it separate but this should be ok 
here you could make it in 2D and use the Pitch for crouch / stand… then you have idle and turn in place in one blendspace for both situations 
some footage 
i have the animations from starter pack and als project
if you need help, feel free to write me
cheers 