Lowering her base hp doesn't really fix the problem really. I managed to max Spica's stats playing only 4 stages without using up any lives. The doki doki points on orgasm is obviously a bit slow with spica's base stats but by simply maximing the amount you can get before dying and beating the boss and raising the right stats(Larcx's choice of stats is wrong... str doesn't make you grind faster... armor and vitality does) it will snowball into an AFK grinding. As long as you steadily upgrade your armor and vitality each time you will be able to hit 100 on both armor and vitality by the 2nd/3rd stage. After you max both stats you can just go to the Oni Samurai stage and make the boss apear and leave him with his 2 grunts alive. As long as they are all in the same plane as you and they initiate the rape from behind you can pretty much alt tab and watch an episode of anime and by the time the episode is over you're still alive with over 1000 of doki doki points. Case in point:
That's the points I've gained after watching an episode of Arslan. I wasn't very efficient in my run but I was able to max out both armor and vitality after the 3rd stage with extra points to boot hence my maxed out esp in this 4th stage screenshot but I really thing it's possible to max out both defensive stats in 2 stages.
And this is one of the reasons why I think that getting doki doki points only from orgasm might not be a good move because it encourages players to well... just toughen up and AFK grind doki doki points by having spica get raped over and over instead of being rewarded by actually playing the game and beating the shit out of your opponents.
Of course you can avoid the AFK grind by simply putting a cap to the number of points you can get from a stage instance. So that's something you can do if you really want to stick with the current doki doki gain system and not reward lazy play.
I know that this theme goes along with Beat Angel Escalayer but even in the original game there's a limit to the number of times you're allowed to do this(unless you want to get the bad end lol) but maybe that's an idea you can also use in this game(evil route get to rape Madoka lol)!