Have a quick suggestion re the career screen. At the moment you have no way of seeing what weight the fight was at until you click on the fight. You could use the little coloured weight boxes you have on the ‘your fighters‘ section. The relevant weight box could be added to the line of each fight.
Also spotted a wee bug. For former champions of different weights the title banner is listing the current weight instead of the previous one. So for example, if an undisputed welterweight champ moves up to middleweight, the banner will say ‘former undisputed Middleweight champion’, not ‘welterweight’.