Is this balanced for BG1 and BG2?

I recently made my first ever class kit for BG2. I was wondering if you would take a look at it and tell me if it is overpowered or not (I tend to think that it may be the former for BG2 and the latter for BG1, but let me know).

I have hidden the old class in the spoiler tags.
[spoiler]
Ranger Class Kit: Slayer

Advantages:

- +2 Strength at Character Creation.
- Can place 5 points in Two-Handed Weapons proficiency.

Disadvantages:

- Must be a non-lawful alignment.
- -4 Constitution at Character Creation.
- Cannot use armor higher than studded leather.
[/spoiler]

Here is the new Slayer class, I worry that even with the massive ability nerf it is still quite powerful.

Ranger Class Kit: Slayer

Advantages:

- +2 Strength at Character Creation.
- Can place 3 points in Two-Handed Sword proficiency.

Disadvantages:

- Must be a non-lawful alignment.
- -6 Constitution and Intelligence at Character Creation.
- -2 Wisdom at Character Creation.
- Cannot use armor higher than studded leather.
- May only become proficient in any weapon that isn't Two-Handed sword.

As you can see from the above I have given the class some more powerful stat loss, probably a bit too much, but I didn't know what else to change to make it weaker, I might try to give it an applied ability for magic vulnerability or something if this is too unbalanced.

Does the loss to survive-ability outweigh the damage gain? Please analyse it twice, once for BG1 (and EE) and once for BG2. What should be changed to make this kit balanced?

I thank you greatly for any feedback you could give.