Changing CON HP bonus for single non-warrior class

I think title is quite explanatory, but let's write something anyway =P

I would like to change bonus HP received from high Constitution stat for a single non-warrior class (Dragon Disciple is what interest me at the moment). How can I do it?

I tried adding new column in HPCONBON.2DA for DD, but it didn't help =/ I attached the edited file, maybe I did something wrong simply.