I just want to remind that this beta bug still persists:
If you capture enemy valor flag, your reinforcements get +30% boost as expected. But if your enemy captures valor flag back, your reinforcements lose about 60% of their health and probably damage as well(it's like you have lost both valor flags).

This is starting health of minotaurs at Cataract.

This is buffed health of minotaurs after capturing enemy Valor flag.

And this is what happens with the new wave(and all upcoming) of reinforcements after the enemy captures Valor flag back.