I'd be really surprised if you couldn't get a boil with the Super GW in your 550. If you do get your hands on some Everclear, try the regular GW again. But now that you'll have both, you've got options! And depending on your cooking needs, you may not even need a full boil. I use little hot water when hiking, between 20-25 ounces a day, and none of it actually needs to boil.
And heck, these little buggers are so small and light, you can carry two if you've got a hiking partner. When I go with my girlfriend, we've been carrying the MSR Pocket Rocket (which we will still use in winter), and we'd trade off boiling water in our mugs. Now that I've got two of these, we can boil at the same time. I think we can handle the extra 13 grams of weight.