Reverse actors HP MP progression

For the first one i'm pretty sure that i tried to do the same... but for some reason it works bad... here what happens:

Starting at lv 5: (base hp value... let's say 200)
- lv 1 ---> 200 hp (start value);
- lv 2 ---> 200 - 11 = 189 hp (it's ok);
- lv 3 ---> 189 + 12 = 201 hp (wrong: it becomes ADC );
- lv 4 ---> 201 - 14 = 187 hp (ok, but not the previous one );
- lv 5 ---> 187 + 17 = 204 hp (uhm... back and forth? )

How it works: 200 - 11 + 12 - 14 + 17 - ... +...-...+...-...

Many tests done by myself confim this behavior... i haven't changed anything else... do you know why this happens, and how to make work it properly?


The second one:
Let's say you have 15 HP... you lv up, and lose 17 HP... so they become -2 HP. The check should set your HP to 0... final result? HP becomes 9999.
So you tell me that they become 9999 before the check?
Since for my hack it's essential that the party members may actually "die" forever i'll choose the hard solution
I'd like to hear about your possible solutions

PS. My idea could be to put a check triggered when HP goes above 9998, that would set HP to 0, but it's a quite brutal solution