Don't know how it was in first event on JP side, but I can vouch that current JP guard event doesn't feature such insane hp bump. HP rises slowly on same scale as first 100 levels, so you are not going to see 8mil before 600+ levels. Either its some misunderstanding between EN and JP teams, or they are just screwing with us.

While I've not played the JP version, I can only agree. The JP wiki clearly states a specific pattern for boss HP, which I posted in the OP. HP starting at level 16 should be level -10 x 10,000

A level 101 boss should have 910,000 HP, not 8.7 million.

I don't understand how they can say that everything is correct with this kind mess. Funny part being that most bosses have 8.7m regardless of their level and they say nothing is wrong 0.o

I seen many bosses level 60 with 1.500.000 power.

I think there are 3 level of bosses

Easy) Power= level * 10.000 - 100.000
Normal) Power = level *10.000 + 900.000
Hard) Power = level *10.000 + 7.690.000

Until 59 boss kills player only get easy bosses.
From 60-99 player get easy or normal bosses.
From 100- player only get easy and hard bosses.

I think before fix players just got easy and hard boses from level 60-.
Players WHO got 100+ kills before fix might not have seen then 1.5M level 60 boss.

It's really unfortunate that the very first event had to end up like this. I suspect that actually fixing the problem might be out of Nutaku's hands; American gamers don't necessarily get much sympathy from foreign developers.

From what I've read, Nordland simply avoided the question regarding the high hp jump up to 8.7m during the first half of the event, which is exactly what the players asked to be fixed. Instead they fixed the bug of high lvl bosses being stuck on 8.7, which I honestly don't think that concerned many players.
And announcing a compensation just to cancel it later was a really bad idea.

IMO this isn't a really healthy way to handle a situation like this during the very first event of a game.
Let's hope Nutaku don't take the "let's leave it like this and wait until they eventually stop asking" approach.

While i have seen a bit how overpowered slayer cards are, seeing as some people get 1m full seductions and stuff, i didn't think about it much. Gave 5 more levels to Akie Ibara and suddenly my elite SED jumped up by 8k 0.o

How up-to-date is the JP wiki? Nordland was claiming in ULMF that the JP version was changed to have the bosses scale the way they are here, and I'd like to see if that's correct.

Just went to the JP wiki, the guard event section and it says: "Last Modified: 2015-07-06 17:28:59" so it's pretty much updated. But the HP table seems to follow the same rules we already know, so unless Nutaku got a notification not published in the wiki, then the current HP scaling is just wrong.

Another topic, I'm seriously considering using my free 100 Nutaku points and try the event gacha with a card revealer, to get another slayer card.
What do you guys think?

Might as well do it. I used mine to get a sacred crystal for aigis two months back so i'd have to get more points. I'd say it could be worth it though, i mean, those points won't really do anything else for you.

I'm considering getting some points since i have 3 card reveals now, although i am still unsure about it.