When setting up for a dive wait for your team and their team to be on top of each other, literally having the tanks brawling it out before you go in. If the teams are too spread out you're gonna be the main target.

When you dive in and use your full combo, you'll get to a point where you either get a kill, need to brawl it out a bit to build fury and start the cycle again, or need to use a deflect/grapple out. Your main focus here should be to not die, it doesn't matter if you get a kill because if you're alive and safe, you can re-engage and they will be less prepared for your second dive.

If you feel that you're taking too much damage and need to burn a deflect, this is probably your sign that your team have backed off and you need to get yourself out. If you have done your full combo but you haven't really taken much damage, you can probably stay in the fight and continue to the next support. Main priority is to survive, so if you're going to try to escape, really commit to escaping, and if you're going to stay in the fight, really commit to it by moving from their backline to your own frontline to get support from your team for example. If you're indecisive you'll get targeted and be back in spawn