From basic information available to us I would surmise that GTVA capital craft jump accuracy is not that great, since they tend to end up having to manuver to engage; the Shivans by way of contrast rarely have to manuver their capital craft to bring their weaponry to bear or to close the range.
In terms of fighters the situation seems slightly reversed; GTVA fighters seem to emerge from jump very close to their targets (or their charges on an escort mission) in most circumstances. It could be the two sides are just playing to their strengths; the Shivans have tradiationally had superior capital craft and the GTVA traditionally superior fighters.
