I see your point but the problem with using percentages is the disparity it causes as the higher numbered side gets more players.
For example -
If you use 10%
1) Team has 200, the other has to have 179 or less for ENY, diff of 21
2) Team has 300, the other has to have 269 or less for ENY, diff of 31
3) Team has 400, the other has to have 359 or less for ENY, diff of 41
As you can see, the higher numbers one team has, the bigger the difference has to be for ENY to kick in. Just seems to work in reverse.
Whereas if you were to pick a set difference in numbers (regardless of actual numbers) where the ENY limits apply (I only used previous as an example) it would seem to more equitable.
Even in your own example a difference of 100 players (1/2 again as much as low team) between Team 1 and Team 2 does nothing. An ENY limit of 2.1 doesn't affect ANYTHING in the current planeset.
So basically Team 2 has a 1.5X advantage over Team 1 without a limit of any kind.
Using your own example again -
If you half all the number of players for all three sides, you come out with exactly the same end figures.
So
T1 100
T2 150
T3 200
results in exactly the same limits as
T1 200
T2 300
T3 400
Therefore same limit applies for 100 v 200 as 200 v 400.
As I said in a way it makes sense to me, but 200 extra players should really result in a heavier limit than 100 extra. Its the drawback to using percentages.
Don't get me wrong I think the whole ENY thing was a great idea, I think I just preferred it when it kicked in earlier but was less severe.