In what way is the performance worse? Remember the late Seafires had different engines and props which can account for some of that performance difference. To put it in perspective, the F.22/F.24 use the Griffon 61 engines which on average put out peak 2035hp at 7000m (through a 5 blade prop, lots of torque!!) In comparison the F.46/F/47 use the Griffon 83 which puts out peak 2340hp via contrarotating props (minimal torque). So at sea level the F.46/F.47 is by far more superior however at altitude the F.22/F.24 would outperform them. In terms of manouvrability, the Seafires don't have to fight that ridiculous amount of torque. Also, the F.24 carried additional fuel compared to some of these Seafires and the F.22, so at full combat load it is heavier (and hence performance worse). It's really apples and oranges: the Seafires were designed to carry out carrier defence and ground attack role, whilst the late Spitfires were high altitude interceptors/fighters (in which ground attack was a secondary role).
FYI, my basis for developing these flightmodels was the Seafire pack. I used the F46 and edited it to match the correct weight, fuel and engine parameters. The airframe are very similar and hence didn't make any further edits to them.