Yeah, I like the poison point system a lot, it means seeing a lot of things you might not otherwise if you get extra lucky.
My interpretation is... there are 6 PP to earn on earth 1-10, 11-20, etc. You can only earn them all once per game. Perhaps when you cleanse a point, you have to choose which block you're cleansing, and if you end up back there, you get poisoned again, but that could be down to personal difficulty/time to complete.
I think this well help increase the difficulty but perhaps reduce replayability as you'll see more squares per game as a result.
When jumping say from E7 to E44, same example as fantasy. You could either count that as moving through all 37 squares, or an instantaneous transport, meaning you would get the point for 1-10, and also the point for 41-50. Or you could say you move through all of them and get all 5 points along the way. Personally, jumping that far should be 'punished' by more points, but this could also be left to personal player preference or difficulty settings. [You already covered this while I was writing it, I like your solution, just offering my opinion and didn't want to delete.

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I'm past the point where I need to cleans points or my rolls will be more than 50% move backwards/stay. Which, while in hell is especially infuriating, being stuck on Hell 1 is fun, but draining >.<
Minor rant/feedback as a transgirl playing this game.
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My only other potential feedback comes from a gender perspective. I assume the majority of users on this site are male, but there are girls among you, and this one is playing this game. I'm not asking you to completely redesign any tease or anything. I can look past pronouns for something I enjoy as much as this game, but some girls may be pushed away by the thought. I don't expect teases to be redesigned or anything, just potential pronoun neutralization. [They/Them is a popular replacement that is gender neutral] It might potentially increase the player base.
I personally would like to see more of this site wide and might make this a topic of discussion in and of itself, but please don't let this derail the topic. I'd also be glad to offer my services for any potential changes this might incur to the game if you decide it's important.