How can i make this sound better?

Unfortunately this is all i have ever ended up with with amp sims. I eventually just bought an amp and I don't have this problem anymore (although micing isn't a walk in the park to learn either). I find that most of the fizz is dialed pretty close to 4khz exactly, maybe a bit higher.
 
Haven't heard your track but I've found that Revalver does a really good job at maintaining minimum fizz. There's only about 2 good sounding amps in the pack though.