I was wondering, how do you guys play in PoFV's extra stage? I'm currently still trying with Komachi and because I pretty much have a question about my own spellcards I'd throw this into the spellcard help topic

So anyway, for some reason I think my playstyle differs from what you are supposed to do. My usual tactic is pretty much, charge a 4 power attack in the beginning to destroy the opponents bullets or cancel out his boss attack. Then start my combo of killing fairies, spamming shift regulary and shooting loads of spirits to keep my chain up and attack the enemy. Then usually the enemy sends out a his boss attack which pretty much gets cancelled immediately by myself reaching 100k chainpoints. However sometimes I get points so fast that Im above the 100k already, that's when I am doing my best to reach 300k quick, ususally unleashing a 2power bomb to secure my area and kill lots of stuff at once(yes that's BOMB, I dont charge, I never do exept in the beginning). Then the enemy usually dies, if he still has imunity (read: in later stages) I continue towards 500k, after which I get points so insanely fast I can bomb the crap out of her.
So one of my main issues is that I do not charge spells (exept in the beginning), the reason for that is that I'm afraid I'll lose my chain and I also have a bad habit of dying while I'm busy charging :V
And the next issue is that I feel like I'm not scoring enough points, this is usually luck based. I can name a good example of that: If Cirno dies immediately after the timer ends I usualy end up arround 1,5million points (its 5million for your first life right?), however if she doesn't die and I am allowed to continue my combo I can reach up to 4,5 million (sub question: How does the 'highest combo' thing work after you beat the opponent? sometimes it says highest combo 1million something while I haven't seen my combo reach over 800k?). So the main question: How can I earn more points? I think on most of my runs I earned about 3 maybe 4 lives?