You only get more range up to a certain point. That point is 5 ST, after that your range cannot increase. Two Heave Ho will give you an additional 6 hexes, but only if you have 5 ST or more. So 5 is optimal.
Finesse isn't so good unless you intend to cripple with the knives, I certainly wouldn't use it with grenades. Even with 85% to eyes, you will crit often enough, and won't have that +30 DR to the target.
I would suggest
5 6 8 1 1 10 10
Small Frame/One Hander
Tag Throwing, First Aid, Traps
More Crit
Heave Ho
Even More Crit
Heave Ho
Lifegiver
Better Criticals
Bonus Rate Of Fire
Lifegiver+
180 throwing
50 traps
FA all other points
218 HP, 10 AP
If you want a drug build, adjust SPECIAL accordingly.
You will have to wait until the last minute on the perks or you can't take them.