I try to set up for 90 deg attacks, with reasonable success. Aim for the Cruiser bow or a hair in front, from 90 deg.,wait until the first "ping" from ships tickles you, then release fast, pull into a high yo yo 180 deg away.
Never go under 90 deg. but you can go over 90, as this next set of pics illustrates...it was a 20 to 1 odds shot, I was the lone JU88 in a snap shot, making a run in, I had to sink the CV in order for the Allies to win..pressure was on, however, they turned the CV just as I made my approach, their fighters were alerted to my presence, and were OTW back to intercept me, so I only had one shot to do it, I took the chance of a 160 deg deflection shot, using kentucky windage and alotta luck...
The first pic shows the angle I was to the CV, the torpedo wake can be seen, its funny looking because the screen capture is off the camera, not an in-game still shot. I had to lighten the picture so you could see everything, it was dusk in the Snap Shot. My JU88 is turning left as I release.
With only one engine shot away, you can see me cruising out of AA distance, witnessing the ship sinking...still amazes me to this day that I manage to get both torps on the CV, at the Aft portion, from 160 deflection.