great ideas!!!I think with your first option the percentage bonus is too high. Instead, just take your Infamy bonus and add it to the floor capture percentage.
floor 5: 5% + 1.3 = 6.3% capture rate
floor 7: 7% + 1.3 = 8.3% capture rate
...
floor 10: 10% + 1.3 = 11.3% capture rate
I also like the second option of giving an exp multiplier to your fams from doing normal battles and boss battles. 1.3% x exp. It would be small, but helpful in lvling new fams especially with how fast they are rolling out new events!