angle method +-2 instead of +-1

1kef A
false detection in +-1 strand1
so I came out method with +-2

and for regular one, +-2 detect correctly too. (ig3p)

1kef A

+-1
1 71.91
5 74.31
4 0.00
3 89.92
2 26.81

+-2
1 3.37
5 10.16
4 22.14
3 44.78
2 14.76

1g3p

+-1
1 89.26
2 49.14
3 90.24
4 159.00

+-2
1 81.58
2 26.23
3 98.49
4 137.03