The purpleheart paddeds are a little too lite, and are a little whippy.
I can see how you might consider them a little light. My Purpleheart padded longswords weigh 2.5 lbs each. It's certainly not outside of the historical range, though. But whippy? The ones I have are completely rigid. I rather doubt I could flex one of them even if I tried to.
I'm no expert, but they seem to work pretty well for me. Certainly millions of times better than anything I ever managed to build myself, especially because they don't break...