You really ought to change your name. What makes you think this fight has any different outcome to the first one? What has Eubank Jr done since then, beat two domestic level fighters?
At the end of the day Eubank Jnr has nothing to bring to the table. If he wants the fight and title he has to take it on the chin and take the lesser percentage, maybe not quite 80/20 but if that's what it is he should take it. bigger fights open up if he wins and will bring the bigger money.