New Moto Guzzi Door Mats Available Now
Prior to these on another bike I used Pelican 1550 cases that were also 100% water/dust proof.
Have you considered looking into replacement gaskets for the lids? I seem to recall that were once available. Perhaps yours have begun to fail.I too have ridden in all day frog chokers (with H-B 40L Juniors) and have not had the ingress of water you describe. I have had a little, but not enough to be an issue.Part way down this page, you will see the gaskets:https://www.hepco-and-becker-luggage.co.uk/products/#John HenryI have a set of 40 Litre HB's that are at least 18 years old and have never had an issue with water intrusion. Inspect and or replace your gaskets. Maybe a smear of silicone lube. I do know that if you are not mindful of those straps inside they might fall down and out the bottom thus ruining any chance of a seal.Skippy
FWIW, I recently spent a day in a downpour and the ammo cans that came on the V85 proved waterproof.