I would say something in the order of 230m/s. That allows to catch up a thrusting fighter which is not very far away. And something like an extra 15-20% of FoV so they can track targets more acurately, which is what is needed in group fights.
These changes wont affect jousts, as tracking there is not so important, neither is speed. 300m/s is maybe too fast, as they would catch up fighters quite far away (take into consideration the added momentum of the firing fighter)