Hello cuco, traditionally the type of wire you are describing is designed to be dragged or pushed depending on whether you are looking for a flatter profile in the weld or if a more crowned bead profile is desired. When you have a groove that you are trying to fill and you would like to do so more quickly, a drag technique might be employed, this will also promote better penetration and help to prevent slag from rolling out in front of the puddle and possibly being trapped in the process of making the weld. The push technique might be employed on thinner materials to minimize burn through and some folks also preferr this because of the flatter weld profile. As far as the weaving goes, if it is weaving and not whipping you may get away with it other than it may promote stress risers in the weld which could lead to cracking, an actual whipping motion will likely cause problems with puddle contamination. Hope this helps some. Regards, aevald