In fact why don't you just use the Goliath stats and call the Half-Giants in your world. Add some fluff (or even rules) about the alignment business, strange as that seems.
And presto you have a play tested and likely balanced race of big, strong and tough humanoids of ECL +1.
That just seems the easiest way to get what you want. Piling on Physical stat increases and reducing mental stats IMO stops being balanced at a point. With the stats you have proposed no one will play a halfgiant unless they plan to be melee monsters and for them the drawbacks just ain't enough as it is stuff (int, wis and cha)they don't care about.
If you compare a standard fighter with a your halfgiant the half-giant will be worse of at very low levels. But at about 4+ level he will be better.
Try comparing the following 25pt buy human and half-giant fighter builds. I know which one I think is the better.
Human fighter level 4; HP 35 (4d10+8): Init +1; AC 19 ( +1 dex, +8 armor); Attack +8; Damage 2d6+6(13); Fort +6, Ref +2, Will +1; Str 16, Dex 12, Con 14, Int 13, Wis 10, Cha 8.
Skills: Climb+10 , Jump +10, Ride +8, Swim +10
Feats: Weapon focus, Weapon specialist, Power attack, Cleave, Expertise, Improved disarm
Half-giant fighter level 3; HP 33 (3d10+12): Init +0; AC 18 ( +8 armor); Attack +9 Damage 2d8+7(16); Fort +7, Ref +1, Will +0; Str 21, Dex 10, Con 18, Int 11, Wis 8, Cha 6.
Skills: Climb+9, Jump +9, Ride +3, Swim +8
Feats: Weapon focus, Power attack, Cleave, Great cleave
Racial ability: Powerful build
Human fighter level 10; HP 80 (10d10+20): Init +1; AC 19 ( +1 dex, +8 armor); Attack +15/+10; Damage 2d6+6(13); Fort +9, Ref +4, Will +5; Str 17, Dex 12, Con 14, Int 13, Wis 10, Cha 8.
Skills: Climb+16, Jump +16, Ride +14, Swim +16
Feats: Weapon focus, Weapon specialist, Power attack, Cleave, Expertise, Improved disarm, Iron will, Improved bull-rush, Great cleave, Improved critical, Greater weapon focus
Half-giant fighter level 9; HP 90 (9d10+36): Init +0; AC 18 ( +8 armor); Attack +17/+12 Damage 2d8+11(20); Fort +10, Ref +3, Will +4; Str 23, Dex 10, Con 18, Int 11, Wis 8, Cha 6.
Skills: Climb+14, Jump +14, Ride +6, Swim +13
Feats: Weapon focus, Power attack, Cleave, Great cleave, Iron will, Greater weapon focus, Weapon specialist, Improved bull-rush, Improved critical
Racial ability: Powerful build