Oh boy, that's crazy. You said it is happening just above the surface so I won't ask you how hard your landings are .

I have couple of ideas.
First, fly with your transponder turned off (if you can)and do some low passes & landings to duplicate the scenario.
Next, maybe you could disconnect the remote switch’sphone cable at the ELT and do some landings. You will need to monitor on 121.5 forELT activation. Resetting the ELT would be a pain because you will need to getto the ELT switch. This would probably trigger a 406 transmission. I think youhave about 50 seconds to cancel it before it sends the 406 data. Maybe youcould advise your local ATC and the people that respond to the 406 calls (AirForce??) and let them know you will be doing some testing that might activateyour 406 ELT.
Also, I would inspect the remote cable’s connections,security, for chaffing, etc.
Honestly if you and ACK can’t solve this I would belooking to replace it with another brand.