I do not know what type of strobe activation you are using, but an electrical sync cord represents 100-150 g of weight added to the system.
If you have 2 strobes, changing to optical fibre can help you with 200-300 gr less (it is not directly because the volume of the electrical cord give you a small impulsion and if you need an optical trigger inside the housing (not being the internal flash) it will also add some weight to the system).
But it will help. And it will be much less bulky that adding floater for that weight. (bulkier rig will make it harder to handle underwater, specially with currents, and sometimes it will mess with the strobe positioning). It might not get you rid of the floaters, but you will need less of them.
The less the better. It is a good principle.