In my experience, bombers can (generally) turn in comparable time to fighters. Lots of bombers can turn quite fast, and can easily bring their superior weapons to the attacking Fighter. Fighters have higher strafes than bombers, so it's more likely that fighters would be dodging the bomber rounds instead of the other way around.
If bomber turning rate was reduced, it would mean they'd have to brave more fire in jousting situations while turning. Currently, the effect can be seen when Light fighters engage bombers. The two joust, the bomber starts turning and the light fighter is already shooting. Maybe this effect can be replicated, but not too extreme (like a Light Fighter vs Bomber). A good bomber pilot should be able to beat a bad fighter pilot, after all.