Good house rule for lifting?, Normal rules seem a little underpowered. Options

[Squinky]

I'm looking for some good alternative rule ideas for lifting, as I am unhappy with the current ones.

Example by the book:
15 kg per str point, Strength and Body test hits add to that.

So a human with 6 strength, 6 body would at most lift 90 kg/200 lbs with no test, and at max, if all all his dice were hits on his test lift 270 kg/600 lbs. Not likely, but I am just throwing out the max end of things.

It just isn't enough, when you look up the current records are all in the 900 to 1000 lbs range for lifting.

I know I didn't break down all the different forms of lifting (overhead and whatnot) but the issues I have scale with them.

When I try and take the simple approach and adjust the lifting rules by dividing 1000 lbs by 6 (to represent the max unmodded human strength) it dosen't scale well in the low ends of strength....

Any ideas? Or existing house rules you guys already use?