If this happens to most First Officers with most captains at your outfit you have an organizational problem. I would go to the standards guy.
If this happens to you (only) with most captains there is something you are doing that is generating that (wrong) response. I would talk with a friendly TC, ask to fly with him and find out if you could do things differently (flare earlier?, etc)
If this happens to you with just a couple of captains. They have a problem, I would hand over control (but not during the flare) as suggested.
When you are next in the sim ask to perform a toga 10 as a late take over from a mishandled landing. I think you will find it quite enlightening, in the airbus it is very hard. You may find a new sympathy for the captains.
Having said all that dual input is a real no no in the airbus for the reasons already mentioned. In my outfit it will be picked up by FDM and a friendly but firm phone call will ensue.