Here's an idea to make piling on a bit less fun and encourage spreading the pain....
When a team has the required 20% of an opponent's bases plus 1 extra, downtimes are modified for attacks against that opponent.
For example:
On a particular map, each team starts with 23 bases, so it takes 5 to own 21.7%.
When a team owns 6 of an opponent's bases (26.1%), downtimes for attacks on the 7th are reduced to 80% of the nominal time. So a 30 minute downtime is adjusted to 24 minutes.
When a team owns 7 of an opponent's bases (30.4%), downtimes for attacks on the 8th are reduced to 60% of the nominal time; 30 minutes adjusted to 18 minutes.
And so on, down to 20% of nominal time.
(Fixed downtimes for hangars and fleets wouldn't be affected.)
This would make it progressively more difficult to capture bases after the required 20% (plus one). So two teams ganging the third would have an incentive to switch to attacking each other after they had set up a "win the map" condition. No forced base capture order, perks, or ENY involved.
