Lots of problems throughout MFN atm with high cost FAs, be careful, if you get too many contracts it could put you in a serious salary cap chaos. Dont know exactly what has happened, but in one of my leagues, I ended up with 4 player contracts on players that I did not make offers to, and 2 offers that were off the scale, dont know how. Something is not right, and I dont know what the cause is other than problem with the new UI. Would suggest that you make a note on your offers, or take screen shots of them, just in case something goes whack, like it did to me.
When trying to sign a high rated player in the first round of early FA, I would set the bonus on max and then slide the salary down to where the minimum bonus amount requested by player was covered, and then give it a little more salary, or up to 30% or more if I really wanted to have a good shot at the player. Never had a problem with salary cap amount. Cant do that now with the high amounts requested, if you make offers on 3 or 4, you could get them all and go south on your salary cap and if its a lot, your roster is decimated. Plus, with leagues that only have a few human owners, there are a lot of high rated FA's that the AI managers did not re-sign, which is one of my major complaints about the AI managers, they wreck a team roster-wise.

Cuz there may not be enough $$$$ !!!