In my position if im interested with other team players i will offering him generous +5 minimum. Eventually he will accept it unless he set higher release amount then i will bid more token for him.
Never i bid with 0 token it show disrecpectful to other managers. Dont be so cheap u actually get a bargain in direct nego.
U can't get any 18y.o with SA (or without) plus 99 rating for less than 20 tokens if u bid openly with so many aggresive managers out there bidding the same players.
So be generous. Offer the managers what u want other managers offer for your players.