fun rotation math that i just cant get right

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Tommo

Here's modified faceeach.
I just change the Atan with your pre-point way to get target rotation.
A mod operation can help you limit the angle within 360.
Happy coding. :-)

Function faceeach(f1:face, f2:face)
	Local ca:Float = EntityYaw(f1.Entity(), True)
	PointEntity(f1.Entity(), f2.Entity())
	Local ta:Float = EntityYaw(f1.Entity(), True)
	
	Local la:Float = 45
	Local da:Float = ta - ca
	Local dif:Float = Abs(da) - la
	
	If dif > 0 Then
		Local da1:Float = Cos(da + la)
		Local da2:Float = Cos(da - la)
		If da1 >= da2 Then
			'use +360 mod 360 to limit angle within 0-360
			RotateEntity(f1.Entity(), 0, (ta + la + 360) Mod 360, 0, True)
		Else
			RotateEntity(f1.Entity(), 0, (ta - la + 360) Mod 360, 0, True)
		End If
	Else
		RotateEntity(f1.Entity(), 0, ca, 0, True) 'restore current angle
	EndIf
End Function