I know statistically wars are balanced in favour of the defending side at an 80% win rate. There are many advantages for the defending team from fort defences etc but I think one of the biggest contributors to the imbalance is respawn at the flag. This is a massive advantage compared to the attacking team which has to respawn at war camp or a flag that has been captured across the map.
As a balance change it would be great to see either respawn times to the flag increased or the defending team having to respawn at the fort.
This will provide more balance and in turn have a higher turn over of lands and encourage more wars.