Using your example pics above I worked out the following:
AOB Gyro Bearing Impact Angle
-120 0 0 -120
-100 30 20 -90
-140 -30 -20 -150
120 0 0 120
140 20 20 140
105 -20 -15 100
So Using the above figures I was able to work out the Required formula to calculate the Impact Angle:
(AOB + (Gyro - Bearing)) = Impact Angle
Popping in the above shows they work out
(-120)+(0-(0))=-120
(-100)+(30-(20))=-90
(-140)+(-30-(-20))=-150
(120)+(0-(0))=120
140+(20-(20))=140
105+(-20-(-15))=100
Now to write the code and test