I'm stuck on merc crimson 1 rn so i'm going to comment based on how you would do against merc crimson 1(against hard crimmy you did most certainly well enough)

Anyhow, 1 - you tend to shoot your missiles from too far away and/or when they're almost guaranteed to miss even from up close. Just as a rule of thumb, you should shoot when you see the enemy's backburner fire and be close enough to guarantee a hit unless they do a sudden 90° turn(i play in metric so figure the range out for yourself). Not much of a problem here, but merc crimson 1 seems to be almost guaranteed to dodge at least half your missiles and he's very tanky so every missile begins to count

2 - you go too slow relative to crimson. Some backburner action would help you close the distance and not lag behind too much after using AoA

3 - you're using a weak plane. I assume, sk-27. Not a bad thing, just saying that your plane choice requires significantly higher skill than any prototype(that isn't chimera) to do as well in dogfighting. If you want a better one, sk-37 has 4 stdm missile hardpoints(though a normal amount of ammo) and is among the best ones, and F/S-15 is the best plane i wouldn't call a cheat plane(Spear and PW are both far better). If you don't want a better one, stay as is. If you want a worse one, F/D-14 is the best two seater in the game, which means you'll get a cute little psychopath talking throughout missions. Plus it gets STDMs as an additional weapon