When you add sugar and yeast, the net result is a longer fermentation. IN grape wine you don't want it fermenting longer than a week to 10 days. If we still see it fermenting, We'll move the batch to a cooler and get it to slow down. If you add all this stuff, you need to add further chemicals to counter act. Degassers get the fizzy CO2 out. If you do the wine naturally, you don't get the bigt CO2 build up. The biggest secret is to not screw with it. Red wines need the grape stocks in the mix to leach the tanins. White grapes don't. WE don't go to all the trouble of pulling every stem out but the wine tastes better if you get some of it out. We double crush the mash. It's amazing how the mash can feel as dry as tobacco. Press it again and more juice comes out. Be patient, get it to boil good for a week or so, change it out, let it rest, change it again, top it off and wait until Christmas. Be careful when syphoning not to disturb the crap on the bottom and you won't need to filter it. I use a syphon hose tied to a stick. The stick is an inch longer than the hose. Once the wine has set up and been changed twice, I bottle and cork it. If you leave air space in the container the wine oxidizes. I use this style of airlock when the wine is fermenting and resting.