I own the same boat with an io. Usually not a problem unless you have a bunch of heavy guys in the back - or some other weight issue i.e. big a** engine. If I do have some big'uns in the back, I use garboard plugs.
There is another 'fix' that a guy on here came up with - forget his name ( seems like a lot of the guys that were here 8-10 years have left - sort of a brain drain... ). Has to do with a piece of PVC that fits in the floor scupper, then a rubber glove's finger gets taped onto it - I know it sounds odd - but it does work really well. Lasts a few weeks then you have to 'change the rubber finger ' -It let's water drain out, and not come back in ( designed after one of those duckbilled garboard drains. Only thing, it reduces drain hole size a bit and is not meant to be left in boat when unattended.
Other than than - life the floor.
I've opted for the above two.
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