I'm also looking and it's 2014!
For anyone else who comes across this: a good idea is to ensure strength--you don't want to have the post buckle under you. One solution is to find a wooden dowel the right diameter (you'll have to do some planing or power sanding to get the curves out, and taper the top end so it goes in farther) and pound it up into the post. To be sure it doesn't fall out, drill a small hole through the post and into the dowel and insert a long, thin screw or nail

This doesn't add a lot of weight and it's well worth it for the safety factor. This has enabled me to raise the post above the max and still be OK. But I'd rather find a longer post.