Start the fight,go for a normal 5 combo. Parry and start charging the heavy until all incinerates are removed,release. Then parry and go again,this time you'll reach an sp1 mid heavy charge go for it to start building up flare state. Parry and do the same until you reach around 5 or 6 flare states and go for an sp2. That is the ideal rotation. You can watch some youtube videos if you're still unsure. Seatin has done a lot of videos on sunspot.