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About the bonusses for Statistics, do the following.

Step for Step Tutorial

1. Go to equipping effects
2. Go to XXXX Bonus (where XXXX is the Stat name)
3. Timing Mode: While Equipped
4. Effect Time: Zero (0)
5. Probability: 0 - 100%, Target: Self
6: Resource Key: , Power: 0
7. Dice Throws: 0 D 0
8. Saving Throw: No Saving Throw
9. Saving Throw Bonus: 0
10. Attributes: Not Dispellable & Bypass Resistence
11. Unknown: 0 0 0 0
12. Edit Parameters:
Statistic Modifier: -XXX +XXX (where XXX is the modifier count, example +4 or -4)
Modifier Type:
0: The Statistic Modifier points are count up by the existing Statistics (increase or decrease of the Stat, like Statistic Modifier 4, Charisma is 15 + 4 = 19)
1: The Statistic Modifier points are now the Statistic (example, Charisma is 15, Statistic Modifier is 10, Charisma becomes 10 while equipped)
2: The Statistic Modifier becomes XXX. % to the Statistic (example, Charisma is 14, Statistic Modifier is 50%, charisma becomes 7, the total value is halved)

Is this sufficient enough Sir Goulum...? If not take a look at Sortaghion (here), it penalizes the wielders Con with -2 and Dex -2.