Don’t try, is my advice. It’s tempting to want to shoot every possibility - I tried doing just that for a long time. But that puts you in a mindset of looking at everything all the time in a sort of frenzy and often missing the opportunities that closer attention would have presented. Much better to decide whether macro or wide will be your objective for a given dive and making those good images while simply enjoying the view of the other, then switching it up for the next dive.
As for normal foam, it will compress at depth and lose buoyancy. Buy the Stix floats, they are cheap and last forever.