Dispatch is only used for dispatch, inflight for inflight - different rules and safety margins apply for what you need to satisfy prior dispatch and what before commencing an approach once you are airborne.
Go-around limited weight is what is limited by the selected (2.5% in your case) go-around climb gradient. Approach climb likely refers to the CS25 certification requirement of 2.1% climb gradient during a go-around with OEI (assuming you're flying a twin), and similarly for the landing climb - 3.2% with all engines operating.