I don't think the Foxx looks that bad. I have wanted to buy a Foxx signature for more than 5 years now, and I have noticed that his signature has a couple variations that all get certified authentic. The "F" is a little different than what is regular, but it's not THAT far off; the rest of it looks okay to me. Especially if you compare the "Jimmie" in your example to this one on eBay, which is PSA/DNA certified. That handwriting looks identical to me. This same example is also missing the swoop through his "F" that many of his signatures have. My wife is a signature checker for elections, and she has been taught that you don't look for what is missing, you look for what is present. And what is present doesn't look that bad. IMO, it might be worth it to send it in.
https://www.ebay.com/itm/Jimmie-Foxx...AAAOSw0d9bSRFF