Pretty late to this, but was thinking about it today (guess why!)
I’ve never had great luck with any booties past an hour. (FWIW, the Castelli Diluvio gloves have been 100% water proof for me, so maybe the Diluvio shoe covers would be good, though likely pricey). Water comes up through the bottom or drips down from your calf. Once the sock is wet it seems to wick all the way down until your Smartwools are sponges.
DIY solutions have been best for me. Duct tape the inside of your shoe! Under the insole and then block any mesh panels in the upper. If you’ve got them, make sure your water proof pants are going OVER the ankles of the booties too.
What has made the biggest difference for me is an extra long front fender. Cut an old bottle in half, drill a hole through it and your fender and zip tie it on so that it hangs to to within 2 or 3 inches of the ground. Leave the zip tie a “touch” loose. If it swings it’ll miss spray, if it’s rigid any toe bump will knock it out of alignment. Blocking road spray seems to be a big chunk of the battle.
