I just thought I'd follow up with the results on this thread since I started it. I ended up installing the 9t sprocket and replacing my green spring with a yellow one. I know I should have done one at a time, but I just wanted to get it done. So, I can't say which was more effective, but between the two mods, the cart is now useable. Before, it wouldn't go up even a slight incline and I had to get behind and push.
My son can now climb the hills on all the grove roads on our property. It's just barely enough power to get to the top, but he's only 9, so he's happy with it.
Thanks everyone for your advice.
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