Drogoz is a good counter since he flies and inaras projectiles are hard to hit and specially if you have W.Y.R.M Jets.If you are good at aiming then the direct shot damage bonus may even be better.
Easy way to kill a fernando is to get behind the enemy and hit him from the back which will force him to turn around leaving him vulnerable to champions that were in front of him before,but you will have to be careful of his allies.
You should move around when facing a bomb king and if he gets you low then try and get near your team, BUT don't stay too close since he does splash damage and it could hurt real bad.
Use Pursuit only when the enemy is low on health since it doesn't do as much damage and if you don't kill them with it you could possibly die,since you are vulnerable and aren't doing as much damage to kill them.