[Radek]

Olli,
1. Skill points: If I understand well, you are speaking about skill points. If it is so, then keep in mind that the number of skill points, which you get during level up, depends on your INT:
INT 1 - 4 : 1 skill point
INT 5 - 8 : 2 skill points
INT 9 - 12 : 3 skill points
INT 13 - 16 : 4 skill points
INT 17 - 20 : 5 skill points
INT 21 - 24 : 6 skill points
This table is valid for all classes. All classes can invest their skill points as they want. Perhaps, your Oomphaz had high INT (they usually did) and got more skill points than, for example a Guork (usually imbecile after character generation). This can be mended later in the game: invest in INT.
Note: After changing role, you will be given 1 skill points until your level in your new role becomes greater than the highest level attained in the old roles - no matter your INT is.

2. Leveling up, hit points: Whenever you level up, the game rerolls your HP from scratch. If the resulting number of HP is less or equal to your current HP, you get only 1 HP. Example:
Suppose your warrior is about to level up to level 5. The game will roll 5 times increase of HP for a warrior and summ all increases. It compares the result with your current number of HP. If the result is less or equal to your current number of HP, you get 1 HP. If the result is greater than your current number of HP, you get the difference between the result and your current number of HP so that the result becomes your new number of HP.
Therefore, ignore number of hitpoints you are getting. You cannot improve it. Well, you can wait for a "good roll" but - next time you get only 1 HP and lose all your effort.
Note: After changing roles, you will be given 1 HP until your level in your new role becomes higher than the highest level attained in the old roles.

3. Levelling up, ability points: AFAIK, you can get
a) 1 ability point - often
b) 2 ability points - not too often but enough often for waiting for a "good roll" during leveling up.
c) 3 ability points - very seldom. Do not wait for 3 ability points, it is futile.
I've never seen more than 3 ability points. I recommend waiting for 2 ability points.
Note: After changing roles, you will be getting no ability points or 1 ability point until your level in the new role becomes greater than the highest level attained in the old roles.