This is all too complicated. Use your Dick'O'kane course/speed plot. Eyeball the intercept. Make a 500yd circle with compass. Get near circle and get to 90 (plus or minus 20degrees) AOB. Make a 0 or 180 straight torp solution. When target gets close enough ID it and set depth if you wish. Down scope. When target gets to edge of your 500yd circle up scope. Fire at 0 + or - your targets speed in degrees. I.e. If hes moving 12kts from right to left on a 0 degree torp course fire at 348 degrees. Even if you're off you are so close you can't miss.
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I stole this sig from Task Force 
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