I'm not sure of the effect opening the beer has...
All I know is you should probably stop it
Brewing really needs two things. Sanitation and patience.
For your next one, try leaving it all alone until it is ready.
Add non-fermentable sweeteners instead of regular sugars.
Bottle it and leave it alone until the carb drops have done their work.
If it isn't sweet enough after it is carbed, don't add more sugar to the bottle - just buy a bottle of ginger cordial and add it to your glass to taste.
If the beer is dry, it's because you added sugars that ferment. This increases the alcohol level but doesn't sweeten the brew. Maybe this is because you opened the bottles, I dunno...