I have been sailing my H20 for 18 yrs. I had a H-16 , two H-18's before the 20. My boats and I have done everything wrong at least once and have made it to the next sail.
If you are sailing in strong conditions and capsize, naturally the mast will fall to leeward. This exposes the bottom of the trampoline to the wind, which in turn pushes the mast down, and thus the "screwed" position. My H20 wants to turtle. I have to move quickly to prevent it by just getting up on the floating hull and letting the boat weather vane around into the wind (be patient to let it come around) then deploying my righting lines.
I never had a float on my mast, but several times wished I had. It can be VERY tireing trying to get a H-20 out of a turtle position even with a crew. Sounds like you are new to sailing a 20, so I strongly suggest a mast float. I thought a good suggestion from one of the responses you received was for the Baby Bob. I've been sailing in warm Mexican waters, but may move my boat to British Columbia where the water is very cold. If I do make the move, I'll install the Baby Bob for safety.
Fortunately the H-20 is very foregiving when it comes to capsizing. The height of the hull from the bottom of the hull to the top of the deck is huge compared to a H-16 or H-18, therefore tremedous volume. You can actually sail the boat on the side of the hull because the side of the hull is so flat. When you have help to upright the boat, test the limits of how high your H-20 will fly.
One other bit of advice that you probably already know--after you capsize and before you try to pull the boat up, make sure you release the main sail by releasing the main traveler line and the main sheet line. Also very important, furrel the jib if you have a furler or just release the jub if you don't have a furler You don't want to haul up the hundreds of pounds of water that the sails
are cupping. And you don't want the boat to sail off without yor before you can remount your steed.
Good sailing and don't be afraid to push the envelope SAFELY. The Miracle is a fantastic boat.